94 Sahara performance problems
I have a 94 sahara with about 140000 miles on it. Inline 4.0 with manual transmission. Everything stock except throttle body spacer. I am having concerns with power, and gas mileage, also starting.
The things I have done so far are, all new fluids throughout, new spark plugs, cap, rotor, throttle position sensor, map sensor, o2 sensor, throttle body spacer, air filter, fuel filter, coil, I think that is it.
When starting it takes about 7 - 10 seconds to start. Is that normal, seems a little slow.
Maybe all I will get but I feel in stock form I should be able to push another 2 mpg out of it.
This is the main one, The motor seems to have a lot of back pressure. For instance it seems to decelerate very rapidly, bangs out of gear when shifting periodically, and engine sounds like its rpms are higher then the gauge says. When driving it feels like gusts of wind are hitting the jeep when cruising at 45 and above. Trying to stay at cruising speeds in 5th gear can be hard, like going up small inclines usually 60 mph and above. Also accelerating in 5th gear is impossible most the time unless slower speeds. Seems like there is no change when pressing gas pedal to floor. I dont mind shifting to lower gears but do to the engine sounding like its running at really high RPMs I'm nervous to.
(Have read about mas air flow, cps, fuel pump, pick up screen, pressure regulator, injectors, catalytic converter, I dont know where to start exactly)
Can cooling system cause any issues?
This is my first post so if you need more info or any suggestions on future posts please let me know. Any other info you need just ask.
Also pulled codes and none to mention, 12 and 55