Car keeps dying and idling rough.....why?

Asked by Mar 07, 2014 at 12:59 AM about the 1989 Chevrolet Caprice Classic Brougham Sedan RWD

Question type: Maintenance & Repair

1989 Chevy Caprice 5.0l TBI dies when
stopping and shifting into drive or reverse,
but idles fine in neutral or park. I've
replaced TPS, EGR, IAC, Coolant temp
sensor,  MAP sensor, fuel filter, pcv valve,
o2 sensor, cap, rotor, spark plugs and wires,
most vacuum hoses, radiator and water
pump. All original with under 26k miles.
Performed fresh oil change. Added Marvel
Mystery Oil and oil light began to flicker.
What's going on?

6 Answers


I would be more concerned about your oil pressure problem first, without oil you will loose the engine.


In some of the older cars, there is a modulator in the transmission. It runs on the vacuum created by the engine. If the modulator goes bad, and it sucks all the vacuum from the engine, it will run rough. Look in to that and see if it helps you out. As far as the oil light, that Marvel mystery oil may have done some real "housekeeping" inside your engine. Try running some good 10W 30 motor oil (not synthetic) without any additives. See how it goes.


pop your radiator cap and fill, let the car run with the cap off, if you see bubbles, the head gasket is bad, also pop a spark plug out of each side, if it's brown like chocolate its fine if its black you could have a bad injector, also to rebuild your throttle body with fuel pressure regulator is about $40

My car doing the same thing I have 32,000miles on car what is the problem?


We had exact same problem. Took forever to find it. Ended up being a crack in the rubber tube in the fuel pump. Small crack but every time we put a load on it, it would die. Like you we replaced everything else unnecessarily. At idle was fine but when pit a load on it it couldn't get enough gas because of cracked hose

1 of 1 people found this helpful.

I have a 1981 curve caprice with 83,something thousand miles every time I started up the engine be revving High like someone pushing the gas some times when I cut it off. It will backfired still can't find out the problem what it is then when I drive it hesitate and stall when I push the gas when I try to make it go up to 45 mph would could that be

1 of 1 people found this helpful.

Your Answer


Looking for a Used Caprice in your area?

CarGurus has 137 nationwide Caprice listings starting at $7,995.


Chevrolet Caprice Experts

  • #1
  • #2
  • #3
View All

Related Models For Sale

Used Chevrolet Camaro
358 Great Deals out of 31,467 listings starting at $3,495
Used Chevrolet Monte Carlo
6 Great Deals out of 1,106 listings starting at $1,125
Used Ford Crown Victoria
3 Great Deals out of 811 listings starting at $2,000
Used Ford Mustang
332 Great Deals out of 41,500 listings starting at $1,488
Used Buick Regal
134 Great Deals out of 5,008 listings starting at $2,495
Used Chevrolet Corvette
109 Great Deals out of 16,238 listings starting at $3,995

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.