So here's the deal guys I have a 94 jeep grand cherokee laredo with the straight six in it. At an idle is runs rough and ecspecially when I put it in drive. Driving it runs fine and seems to have power but I can't figure out the cause. I have a cold air intake, magnaflow exhaust, accel super coil, wires and plugs, and distributor cap and rotor. I have put fuel injector cleaner in and didn't really help. I tried cleaning the throttle body but no change. So if anyone has any recommendations it would really help thanks!

 

I have the same problem and a similar set up. Any advice would be great.

Thanks.

 

My jeep is doing the same thing, only at a stop while in drive gear. But in neutral the roughness subsides a bit. But when I drive above 5mph, the roughness goes away.

When I get some money, I am going to clean out my MAF sensor, IAC sensor, and Throttle Positioning Sensor as well to see if that works. I've read that this cures 95% of what is happening to our Jeeps.

 

i noticed when i seafoamed my engine it changed how it ran amazingly.... i just pulled the intake tube off, throttled the motor up a little and slowly dumped the seafoam in and let it run through, MAKE SURE you are outside it will smoke like a MFER! lol

 

I don't think you could have put it in better words ha that's the exact thing that is happening

 

did it get fixed and if so. How

 

did you fix it...i have the same problem

 

It sounds like you have a sticky IAC. Cleaning the throttle body does not sufficiently reach inside the IAC bore. Removal, cleaning and reassembly is simple, takes about 30 minutes and is inexpensive ($3 for a can of TB cleaner). You will need Torx-tipped tools. There are plenty of how-to videos out there if you want to see how to do it. Note that there are pitfalls, as the pintle is easily mishandled, so definitely bone-up on the task first. Good luck.