Question about 1999 Mercury Cougar

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Car starts fine but revs up to about 2000rpm then dies but if i keep on throttle it run great down the road until i have to stop then the brake petal is hard and it dies

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  • Anonymous Mar 28, 2014

    cut off while driving down the road . would not restart

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  • Master
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You need to check for a large vacuum leak some where

Posted on Dec 11, 2009

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3 Answers

I have a Ford 1990 f250 xlt 7.5 When starting revs up and down slowly then dies sometimes, why?


Clean the throttle body and idle air control motor(IAC) on the side of it. Mostly the IAC and the hole it sets in. Also check the air filter.

Apr 26, 2015 | 1990 Ford F250

2 Answers

When my car warms up it will not stay started it will die unless i keep my foot on the gas petal to prevent it from dying


Change the sir-filter and fuel-filter. Also clean out the air-filter box the filter sits in. If the problem persists, remove the air-intake duct that goes to the throttle body for obstructions. Also look at the air-horn and throttle-plate. Is there carbon in the air-horn and throttle-plate? If so, carefully clean the airhorn and throttle-plate with a clean, dust-free rag sprayed with automotive solvent.

If you still have the pronlem, you might consider the engine temperature-senser.

Mar 08, 2015 | Mazda Cars & Trucks

1 Answer

Ok my problem is my wife was going down the road and hit the brake as she came to a stop sign and out of the blue it starts accelerating and took her putting it in neutral and shutting off the car to get...


run the fault codes to determine the fault. If the ignition is off and the engine is still running then the fault is very serious and should be repaired promptly and not driven until the fault is identified and fixed. A run away engine is deadly on the road.

Aug 03, 2013 | Cars & Trucks

1 Answer

When I start the car it stays at 2000rpm for a few moments then drops down. I'll drive for a few minutes then put it in park and it revs up and down.


idle air control valve is bad replace it. at start up choke control runs till warm up while driving throttle opening controls engine at idle ,the idle air control valve.

Aug 01, 2012 | 2005 Chevrolet Aveo

1 Answer

I just replaced Fuel Pump, truck starts fine but when I drive it bogs out like its running out of gas


Assuming it does have gas in the tank, I would check the fuel pressure at the rail if its MFI or the throttle body if the injector are there.
Also, did you replace the fuel filter when you replaced the pump ?
Any chance you connected the pump to the wire that goes to the sending unit by mistake ?

Jul 07, 2012 | GMC Sierra Cars & Trucks

1 Answer

MY 1999 1.8L PASSAT HAVING THROTTLE PROBLEMS REVS UP DIES DOWN REVS UP DIES DOWN THE MECHANIC SAID IT WAS THE THROTTLE BODY THEY CLEARED THE CODES INSTALLED THE THROTTLE BODY AND WORKED FINE UNTIL I TURNED...


it can still cause trouble, im a former vw tech, and you would be amazed at how long they last or issues that arrise, I watched a tech install an engine once because he refused to belive radio was failed,

Jun 09, 2010 | 1999 Volkswagen Passat

1 Answer

Jeep liberty 2002 3.7when starting cold starts-stalls unitl hot


Check the temperature sensor feeding the ECU and O2 sensor.

Apr 12, 2010 | 2002 Jeep Liberty

2 Answers

I have a 03 tiburon gt 2.7 and when you hit the gas the engine revs up to about 3100rpm for about 10 secs the drops down to about 1500 and surges up and down form 1500rpm to 2000rpm then it will idle...


its gonna be your clutch i had the same problem, when i floor it the rpms would go high then drop and take off i replaced it and it runs fine know

Feb 13, 2010 | 2003 Hyundai Tiburon

1 Answer

When engine is warmed up the car begins hesitating


I really think it's the TPS, (throttle positioning sensor) on the throttle body. When this sensor is defective or out of position the vehicle will idle like that and even stall. If you haven't had it scanned, you should do so, that will probably tell you the problem.

May 28, 2009 | 2002 Nissan Xterra

1 Answer

1996 Jeep Grand Cherokee stalls when brakes are applied


My 2000 Grand Cherokee had the same problem, without all the sputtering, it would just die approaching a stop. We could only keep it running by slightly pushing down on the gas petal when coming to a stop. I replaced the Throttle Position Sensor, but that didn't change anything. A new mechanic I found replaced the Idle Air Control Valve, and we've had no problems in a week.

Jan 02, 2009 | 1986 Jeep Cherokee

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