My idle is the same way. Been that way for a long time.
I replaced the plug wires and plugs and that didn't seem to help. I have a scan gauge and it doesn't look like my tps is acting funny.

I just installed the mopar s3 turbo and fueling. Started the car on the s2 PCM and I've still got idle miss. No codes. I was hoping the idle issue was my stock fpr but it wasn't. I'm driving it to the dealership Tuesday to get my used s3 PCM vin flashed but I'm betting it'll still miss.

Initially the car idles smooth and then I can hear a click around the pass side wheel well. From then on it misses. If the s3 PCM doesn't fix things I'm going to look into the evap sys.

 

Jiggle the IAC wiring harness and see if the idle changes then spray some carb cleaner around the throttle body and intake manifold mating surfaces and listen for a change in the motor.

 

Had the same issue plus more a long while back. Tried everything to fix it. The thing that ended up fixing it was putting some dielectric grease on the coil plugs and tops of the spark plugs... no idea why but I've never had an issue since!

 

I already covered my coil and plugs with dielectric grease. When I was doing that, I noticed that my 1 and 3 contacts on the coil both had a small brown spot on them, but they didn't really look burnt. I'm almost thinking it's a bad injector, I already tried running a bottle of injector cleaner through... it didn't make a difference.

 

mines been doing the same since i bought the car 3 years ago also. Completely stock 50,000 miles. I replaced coil pack, wires, and spark plugs still does the same. Car still drives fine though other than my tps issues.

 

By the way, there are NO CODES which is actually pissing me off in this case.

 

What happened when you followed my suggestion? Also, you have the wrong plugs in the car. Those are 1 step colder then stock which are for cars making 75-100hp over stock. Put in NGK 4306's stock heat range, gapped .040.

 

For those who care, it was the fuel injectors

 

^Nice I have the same problem and I think one of my stage 2 injectors are going bad because Ive tried everything else. Did you just buy all new injectors or did you have a spare set?

 

what was wrong with the injector?

 

No idea, they looked fine from what I could see. I just bought some used stage 1's and swapped them in.

 

Just to ad to an old thread, I have a pop in my Idle as well as a CEL for p0302 misfire in cylinder 2. What I did and what anyone else can do that comes across this thread is.

1. Pull your fuel rail

2. swap the bad injector with another

3. reinstall fuel rail

4. reconnect battery (disconnect battery first duh)

5. prime the system with fuel by ignition key on/off 3-4x

6. drive and wait for a CEl code to appear if it jumped cylinders you have found your issue.

mine went bad around 145,000.. couldn't figure what it was until I got better at mechanics
ran it like that for 20,000 =0