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My car is a 1992 Dodge Stealth R/T with the non-turbo 3.0 DOHC engine. I'm told this same engine is used in the Diamante. I have searched every forum and i'm still unable to fix my problem. A brief history of my problem. Mileage on engine is 138,000 miles. The problem is most notable when you are doing 30 mph and you try to maintain that speed.
The engine will buck back and forth. When you give it more gas and run it through the gears it smoothes out. But you can still feel the "miss". At idle you can just listen to the engine and hear the miss. The idle speed is constant but there is a slight miss to it. I have heard this a common problem with these engines but no clear cut fix.
This problem does not trip the CEL. What I have done so far: Replaced the spark plugs-new spark plug wires-new 02 sensor-new fuel filter-sent injectors in to get flow tested and rebuilt-swapped the 3 coils from another engine,also swapped the CAS sensor-changed all the vacuum hoses-tested the TPS sensor and it checked out-pulled the computer and checked it for leaks-it looked brand new-pulled trouble codes with the voltmeter-it showed no codes.
I had another Stealth owner who said his did the samething and his mechanic told him it was the MAF or MAS sensor. Mine also looks very good. The reason I haven't changed that is because I was told it it's bad it "will" trip the CEL. So that's the history. I'm just hoping that one of you has had this same problem and you could steer me in the right direction. Many thanks for your help! John