My caddy is running rough on 1990 Cadillac DeVille

stalling, running rough upon stopping and preceeding, burning too much gas. Can anyone help???

by in Bridgeport, PA on April 12, 2009
5 answers 5 comments
ANSWER by on April 13, 2009
Have you had a tune up lately, new spark plugs ( AC Delco R44LTS6 .060 gap ) and a air filter can make a huge difference
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COMMENT by on July 06, 2010
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ANSWER by on May 25, 2010
i have a 1990 that all the same problems u are having and its sounds like alot of other people . So like u said it starting running ruff feeling like it was going to die then it did staring dying stalling out at random so i staring the replace alot of things first the fuel filter then the cadi converter then i starting getting into the distirbutor anyhow it lasted months then fnally said f it and changed the whole distirbutor and it ran great for a week and then stalled on and the computer was telling me the whole time it was the distirbutor so i changed the computer and its ran great but my water pump just went out like a week ago but i've already replaced it and that was a pain in the butt
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COMMENT by on June 24, 2010
My 90 deville did the very same thing yours is doing, drove me crazy for months, replaced distributor, plugs, wires, fuel pump, filters, vac lines, cat convertor, to no avail. Then I was almost ready to give up, I tested the fuel injectors, egads ... only four were working. I replaced them with the bosch design III. This car will now run at 34mpg on the highway ! Well worth the investment and fixed the miss and roughness. If you do this, I suggest to replace the fuel regulator as well, it will help since you have the fuel rail off. You will have to loosen the ps pump and slide it back to get the last injector out. Don't forget to relieve the fuel rail of the gas and don't turn the key until you are completely done or take the fuel relay out.
ANSWER by on December 05, 2010
Use Lucas Injector Cleaner or Sea Foam Injector Cleaner use eather one about 4 oz throu large vacume line from brake booster to yo motor with the motor runing the vacume will suck it throu the intake . Make Sure The Tail Pipe An The Hole Car Is Not Around People A Large Amount Of Black Smoke Will Come Out Of Yo Tail Pipe . an put about 12 to 16 0z in a tank of gas every 3 months.
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ANSWER by on December 27, 2010
vacum leek or tuneup
ANSWER by on October 16, 2011
it is probably the plenum boot, this is a very common problem.
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