It sounds like you need to get a new cam position sensor and distributor cap. It also sounds like you need to get the broken off screw out of the distributor housing. You may be able to get it out with a carefully chosen drill bit and easy out with it still installed. If not, you will need to pull the distributor out and either get the screw out or replace the distributor.
In the event you need them, here are the destructions: see this post for pics
(1) Disconnect negative battery cable at battery.
(2) Disconnect coil secondary cable at coil.
(3) Remove distributor cap from distributor (2
screws). Do not remove cables from cap. Do not
(4) Disconnect distributor wiring harness 3–way
connector from main engine harness.
(5) Remove cylinder number 1 spark plug.
(6) Hold a finger over the open spark plug hole.
Rotate engine at vibration dampener bolt until compression
(pressure) is felt.
(7) Slowly continue to rotate engine. Do this until
timing index mark on vibration damper pulley aligns
with top dead center (TDC) mark (0 degree) on timing
degree scale (Fig. 38). Always rotate engine in direction of normal rotation. Do not rotate engine
backward to align timing marks.
(8) Remove distributor holddown bolt and clamp.
(9) Remove distributor from engine by slowly lifting
(10) Note that rotor will rotate slightly in a counterclockwise
direction while lifting up the distributor.
The oil pump gear will also rotate slightly in a counterclockwise
direction while lifting up the distributor.
This is due to the helical cut gears on distributor and
(11) Note removed position of rotor during distributor
removal. During installation, this will be
referred to as the Pre-position.
(12) Observe slot in oil pump gear through hole on
side of engine. It should be slightly before (counterclockwise
of) the 11 o’clock position (Fig. 39).
(13) Remove and discard old distributor-to-engine
(1) If engine crankshaft has been rotated after distributor
removal, cylinder number 1 must be
returned to its proper firing stroke. Refer to previous
REMOVAL Step 5 and Step 6. These steps must be
done before installing distributor.
(2) Check position of slot on oil pump gear. It
should be just slightly before (counterclockwise of)
the 11 o’clock position (Fig. 39). If not, place a flat
blade screwdriver into oil pump gear and rotate it
into proper position.
(3) Factory replacement distributors are equipped
with a plastic alignment pin already installed 36). This pin is used to temporarily hold the rotor to
the cylinder number 1 firing position during distributor
installation. If this pin is in place, proceed to
Step 8. If not, proceed to next step.
(4) If original distributor is to be reinstalled, such
as during engine overhaul, the plastic pin will not be
available. A 3/16 inch drift pin punch tool may be
substituted for the plastic pin.
(5) Remove camshaft position sensor from distributor
housing. Lift straight up.
(6) Four different alignment holes are provided on
the plastic ring (Fig. 40). Note that 2.5L and 4.0L
engines have different alignment holes (Fig.
(7) Rotate distributor shaft and install pin punch
tool through proper alignment hole in plastic ring
(Fig. 40) and into mating access hole in distributor
housing. This will prevent distributor shaft and rotor
(8) Clean distributor mounting hole area of engine
(9) Install new distributor-to-engine block gasket
(10) Install rotor to distributor shaft.
Pre-position distributor into engine while holding
centerline of base slot in 1 o’clock position.
Continue to engage distributor into engine. The rotor
and distributor will rotate clockwise during installation.
This is due to the helical cut gears on the distributor
and camshaft. When distributor is fully
seated to engine block, the centerline of base slot
should be aligned to clamp bolt mounting hole on
engine. The rotor should also be pointed at
5 o’clock position.
It may be necessary to rotate rotor and distributor
shaft (very slightly) to engage distributor shaft with
slot in oil pump gear. The same may have to be done
to engage distributor gear with camshaft gear.
The distributor is correctly installed when:
² the rotor is pointed at 5 o’clock position.
² the plastic alignment pin (or pin punch tool) is
still installed to distributor.
² the number 1 cylinder piston is set at top dead
center (TDC) (compression stroke).
² the centerline of the slot at base of distributor is
aligned to centerline of distributor holddown bolt
hole on engine. In this position, the holddown bolt
should easily pass through slot and into engine.
No adjustments are necessary. Proceed to next
(11) Install distributor holddown clamp and bolt.
Tighten bolt to 23 N·m (17 ft. lbs.) torque.
(12) Remove pin punch tool from distributor. Or, if
plastic alignment pin was used, remove it straight
down from bottom of distributor. Discard plastic pin.
(13) If removed, install camshaft position sensor to
distributor. Align wiring harness grommet to notch in
(14) Install rotor.