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Q: CAR RUNS REALLY ROUGH/ SKIPS MISSES/WANT SMOOTH OUT AT ALL
WHAT CAN I DO NOW? on 1990 Cadillac DeVille

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
HAVE CHANGED WIRES,INJECTORS,DISTRIBUTOR COIL.CAP,PLUGS,MODULE,
TPS SENSOR,AIR CHARGE SENSOR
(1) Answer
stop with all the parts replacing and go back to basics.

you need to do a compression check to verify the motors ability to work well. you need to do a vacuum test and test for vacuum leaks as well. you need to find the reason before replacing parts.

Roy