I'm working on a 92 Olds cutlass ciera. Just this morning I got into to start it up and idled real rough.........didn't feel it was motor related, but more like the convertor was locked at idle.......car shook like hell, as if in a manual tranny that was upshifted way too early..........any suggestions ?.....would this be a symptom of a tcc solinoid stuck in the locked position ?