1992 Olds 88 Transmission

I just had the transmission replaced in my 1992 Olds 88 (41k original miles). After the work, the engine has very little pick up from an idle but smooths out once it gets up to 20 mph. The rough idle is like it is missing on one cylinder. I replaced the spark plug wires but that has not fixed the problem. Any thoughts?

Welcome to AF, a bad coil, bad plug, bad injector, vacuum leak can all cause this, did this happen right after the trans was done? If so have the shop look over anything they may have disturbed.

The shop (I will leave them unnamed) struggled with the trany for 2+ weeks. They damaged the CO2 sensor wire and I had to replace it. How do I test the items that may be suspect?

Look at the connectors on the injectors, make sure the wires are in the right sequence, go back over what they may have gotten into during the process, .No way to know what they may have done, if in fact that is the reason for the problem.