not running smoothly

Asked by Jun 19, 2017 at 08:43 PM about the Cadillac DeVille

Question type: Maintenance & Repair

have 90  coupe deville.  ran fine when stored in dec. with full tank of gas and
injector cleaner added.  came out in april keeps acting like it wants to stall out
and even does once in awhile.  mechanic's had it more than i have and still
can't find the problem.  any input would be appreciated.

2 Answers


If you can drive it long enough to use up the old gas, fill it up with Chevron gas and also add a bottle of Techron. Drive it for a while and hopefully your problems will clear up.

Best Answer Mark helpful

Five months of storage is not that long. A full tank of gas will not go bad that quickly. That year Caddy had the 4.5 liter V8. The idle motors on those cars were notorious for failing. Either causing extremely high idle, idle low enough to stall. or a combination of both. Those cars still had a traditional cap and rotor ignition setup. Five months of damp storage can easily corrode the contacts.If the car runs well while driving but has a rough idle when sitting still in gear. Check the ignition system. If the car seems to run fine but just dies at idle especially in gear check the idle control motor.

Your Answer

Cadillac DeVille Experts

  • #1
  • #2
  • #3
View All

Related Models For Sale

Used Cadillac DTS
23 listings starting at $5,100
Used Lincoln Town Car
13 listings starting at $1,850
Used Chevrolet Corvette
481 listings starting at $9,900
Used Cadillac CTS
13 Great Deals out of 347 listings starting at $3,450
Used Mercedes-Benz SL-Class
3 Great Deals out of 112 listings starting at $10,900
Used Mercedes-Benz S-Class
7 Great Deals out of 152 listings starting at $6,777
Used Cadillac Escalade
5 Great Deals out of 504 listings starting at $4,980
Used Chevrolet Impala
158 Great Deals out of 1,114 listings starting at $2,950
Used Ford Mustang
1,056 listings starting at $3,900
Used Cadillac STS
8 listings starting at $20,500
Used Chrysler 300
68 Great Deals out of 830 listings starting at $3,295

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.