random downshifting/snubbing out?
i've searched for a while looking for any symptoms similar to mine, and haven't found any that were exactly the same.
I have a 94 bonnie SE, and ALL at once the cruise control would either not work, or it would randomly downshift and the CC would kick off. also, at slow speeds, the idle dips, and kills the engine if approaching a stop sign. I must shift to Neutral and restart. the car runs fine at highway speeds, but usually stays out of top gear.
It did throw a code, and the code says misfire in cylinder 4. I replaced all the spark plugs, the wires, and swapped the coil, but nothing changed. I also checked for intake leaks. nothing. I figured because of high mileage and short trips, the inside (hotter) cylinder 4 could have a clogged injector. I ran a whole tank of Industrial strength detergent mix from GM and still same thing. I think my next move is to switch the injector.
Also, if i start up cold, i can drive about 7 miles until the cruise will flip off and it starts going in and out of top gear. it runs cherry up until that, and usually doesn't have a problem at stops either.
If not the injector, what else?????