RPM's drop while driving
Randomly over the past couple weeks, my RPM's have been dropping while cruising down the road, usually under 3000 rpms. While parked, the idle is erratic, usually when I start it in the morning it will jump up to 1500 and stay there for a while. CEL is a code 21, but I replaced the o2 sensor a couple months ago, and the cat is less than 2 years old. I just replaced the TPS on monday, because I had symptoms telling me thats what it was. Well, I still have the same problem.
Ex: I was driving home from the movies tonight and all was well. I was on the highway and I felt a sort of "slip". I say that because it feels like the transmission is slipping, but its not. I can see the rpms drop. It got worse within the next 30 seconds and my CEL came on. After that, it was "slipping" every couple seconds, and the only way to get out of it was to floor it.
I have done:
Replace o2 sensor
I think the MAP sensor would be next on my list, but I don't want to keep driving down a dead end road here. Plenum repair needs to be done, and I dont think I have any vaccum leaks.
I am at a loss here. Couldn't seem to find a solid answer in the search.
Edit: forgot to mention I got a code 32 yesterday, which is egr is bad, after I replaced the TPS. I got it a few months ago when I replaced my o2 sensor, and didnt get it again until yesterday, and it hasnt come back since.
94 Grand Cherokee 5.2 33in. Federal Couragia M/T's on Procomp Steelies, np231 swap, IRO Hack n Tap SYE, Carolina Driveshaft, 4.5 in. lift, RE front upper/rear lower ca's, RC front lowers, Ironman rear uppers, IRO 4.5 coils in rear, 3.5 and 2" bb (no isolators) in front, Bilstein 5100's, Clayton/JKS adj. track bars, KOR rad support and SS, Magnaflow/Flowmaster exhaust, clear corners, custom light bar w/ Hella 500's
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