Hey guys I am having a problem that I cannot figure out. I know there are ten thousand idle problem threads but none cover my problem.
258 I6 ~250k miles
Motorcraft 2100 1.08
MSD Digital 6 (CDI type ignition)
MSD TFI coil
Taylor 8.2mm wires
Teamrush cap and rotor
Timing set to 8-9 degrees no vacuum advance
Autolite copper plugs gapped .055
all vacuum lines removed except pcv and breather
all computer and other misc. wires removed
all emissions related components removed. (excluding converter)
K&N 9" custom air cleaner
SOMETIMES at idle motor runs very poorly. feels like it is not running on all cylinders. This is not a constant condition. it comes and goes with no discernible pattern. one minute rough then at the next stoplight smooth as a beamer... when rough I am talking the jeep shakes like a beast. I did read somewhere that it could be the egr opening for some odd reason at idle but with no vacuum hooked to it this should not be the case.
There are no vacuum leaks to be found.
Now the thing is... it runs awesome!! anything above idle and it hauls like crazy. can stomp the gas in any gear and it will pull hard. does not miss, hesitate, sputter, or anything that would indicate other problem. I highly recommend the MC2100 swap to anyone who is thinking about it. It has breathed a whole lot of new life into my tired old jeep
After installing the carb I noticed it can be hard to start after a short stop like going into a store for 10-20 mins. Engine turns over and over like it is not getting gas. fuel pressure read stable last time I checked it 4-5 weeks ago. on the carter there was a float needle type one way valve in the main fuel line that was not able to be reused with the motorcraft carb. could the gas be draining out of the fuel line and then the fuel pump has to repump all that gas up the line?
Thanks for any direction.