Engine Shakes when stopped?

Asked by Nov 12, 2016 at 11:02 PM about the 2002 Pontiac Bonneville SSEi

Question type: Maintenance & Repair

Okay I have a 2002 Pontiac Bonneville 3800
Series 2 Supercharged. I just bought the car
and used code scanner on it and said I
needed new injector cause 4th was misfiring
so I changed that. But now heres my other
problem Engine shakes when car is sitting
and running. And how I start my car is I half
to turn the key and hit the brake and the gas
at the same time for atleast 10 mins if I don't
push the gas car will automatically shut off.
And I can't just turn the key to start it I half to
push the gas or it will just keep cranking. I
really need help to fix that problem if anyone
knows why the engine could be shaking or
why I half to hit the gas for 10 mins to start
it let me know thanks

1 Answer


A trouble code P0304 could be a bad spark plug, spark plug wire, coil pack, poor compression on the cylinder, OR a bad fuel injector. If your Bonneville has over 100,000 miles on it and you don't know if or when it was last tuned up. Do a complete tune up which consists of new spark plugs and new spark plug wires. You'll want to use iridium spark plugs. They'll go for another 100,000 miles. This may solve both issues. If you still have the starting problem clean the throttle plate and IAC (Idle Air Control) valve with carburetor cleaner. HTH. -Jim

3 of 3 people found this helpful.

Your Answer

Pontiac Bonneville Experts

  • #1
  • #2
  • #3
View All

Related Models For Sale

Used Pontiac Grand Prix
1,943 listings starting at $3,000
Used Chevrolet Impala
395 Great Deals out of 27,759 listings starting at $1,499
Used Chevrolet Monte Carlo
962 listings starting at $3,300
Used Pontiac Firebird
5 Great Deals out of 653 listings starting at $4,999
Used Buick LeSabre
8 Great Deals out of 1,241 listings starting at $799
Used Ford Mustang
326 Great Deals out of 38,826 listings starting at $1,995
Used Buick Regal
105 Great Deals out of 4,267 listings starting at $3,498
Used Chevrolet Camaro
266 Great Deals out of 30,432 listings starting at $4,200
Used Pontiac Grand Am
762 listings
Used Buick Park Avenue
294 listings starting at $4,500
Used Nissan Maxima
241 Great Deals out of 18,445 listings starting at $930

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.