Rough idel when in drive miss fire - 1992 Cadillac Eldorado

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Sounds like you incorrectly installed the spark plug leads

i have seen many strange things happen with the distrib cabs on these

If you can find the PCV valve and it's associated plumbing, I promise that you'll find one of the rubber elbows that connects it to the intake manifold has rotted out and is leaking vacuum. This is a very common problem.

a dirty or miss firing fuel injecter was a common thing on them vans i would have the injecters tested and cleaned.

Sounds like you disturbed a ground wire somewhere and you will need to look everywhere that wrenches where turning to find it.

Check make sure all plugs are firing. Sounds like what my 93 Rodeo was doing-Idled okay but very rough when in gear. Turns out only 5 out of 6 plugs were firing due to a defective ignition module- 100 bucks later it works fine.

Hope this helps.

Barring any mechanical issues you most likely have a failed injector.

Sounds like a load miss. Chk plug wires for deterioration and or cross firing. Wires should not cross over each other. Worn plugs load wires causing increase spark out put increasing cross firing potential

hi you need to find out what the fault codes say but if the two cylinders are next to each other and are running to hot the miss-fire is on these two cylinders do a compression test on these two i suspect the head gasket has gone between the two if everything is ok have a look at the distributor cap and rotor yates210456