Cecil Fenimore

I have a 97 grand cherokee lerado 4.0 the engine keeps stalling out at red lights and it has a sever miss i have give a complete tune up and replaced the fule filter plugs and wires and destributer cap and rotor and air filer and cleaned injectors and intake and checked vacuum i cant find out what is causing it

kody24

I would get it scanned. most auto parts stores will do it for free, autozone does for sure. It sounds like it may be a crank position sensor, but that's just a guess. you should be able to google search how to check the codes without a scanner. I know for most mopars you turn the ignition switch on-off-on-off-on, and then watch either the check engine light or digital odometer. the digital odometer will display all of the codes the computer has stored so you can look them up, if it's the check engine light, it will flash, and you count the flashes, there will be a break between codes. this works for the obd1 models, and should work for obd2 as well.

GreaseMonkey17

kody24

Not a bad idea.

kody24

It could also be a vacuum leak, EFI engines are better able to compensate for this and can hide the issue better, but it is a possibility. A major leak, like on the line to the brake booster can cause those symptoms, not necessarily a miss, but something similar to it.