Question about 1993 Cadillac DeVille
OK, check for spark in each spark plug wire using the spark tool.
Then, check that all of the injectors on the 4.9L engine are working by listening for clicking with the assistance of a stethoscope on each injector.
If either system, spark or fuel turns out to be bad, the computer might be the culprit.
I have a 1990 Cadillac Deville that would miss badly due to a fuel injector not firing, and it turned out to be a bad computer.
One can get one for about $80 from a salvage yard.
Posted on Oct 14, 2010
Hi! Two things to look at. The TPS (throttle position sensor) may be faulty that's why it sputters. Have the MAF (mass air flow) sensor be checked too. If you have a faulty MAF you'll have unusual idling and the engine may go off. Hope this shed some light and thank you for using FixYa!
Posted on Oct 13, 2010
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Posted on Jan 02, 2017
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This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control
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