I have a 89 jeep 4.0 auto with a crack ex. by the 02 sensors but I don,t have time to fix it or the space,I need it to last 2 months.It stalls on me on hard braking and sometimes when I put it in park,idles bad but OK when under throttle.Any tips to help me limp along.I clean the idle sensor when gets real bad and it helps ,new spark plugs as well.Would better gas help.Any ideas would help ,thanks

 

I wouldn't worry about the crack. Make sure your intake manifold bolts aren't loose. Inspect all vacuum lines. Click on the link in my signature and read up on ground refreshing and the like. Many times that's all you need to do.

 

cause a bad idle?

1. TPS (Throttle Position Sensor)
2. Idle Air Control (IAC) motor
3. Vacuum leak
4. MAP sensor?
5. Bad battery (effects ECU)
6. Clean Throttle Body? (getting stuck?)
7. CPS (Crank)
8. Cam PS / Distributor Pickup Switch
9. Distributor cap, rotor, wires, plugs
10. Low fuel pressure?
11. Bad alternator ?
12. O2 sensors (should throw code)
13. Bad injector?
14. Replace coil?
15. Intake Manifold Vacuum leak?
16. EGR valve?
17. CCV hoses clogged?
18. Fuel filter?
19. Air Temperature Sensor?
20. Coolant Temp. Sensor