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The car stalls slowing down. Can this be caused by a bad gas cap?

Is it possible for a bad gas cap to cause the car to stall when slowing down, as in exiting the hwy?

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Not likely, But you are probably correct that the fuel delivery system is not operating correctly. This could be a hazard to you or someone else. I recommend you take to dealer or your trusted mechanic as soon as possible.

Posted on Apr 02, 2015

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Posted on Jan 02, 2017

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Car all of a sudden after getting gas wants to stall and slow to accelerate it also sounds rugged and wants to stall, could it be bad gas?


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2003 Ascender stalls after driving about 8 miles when I brake, you can see the revs go up and down and then it stalls. It starts right back up again but this keeps happening. Any idea what could cause...


I would say the vacuum modulator for the power assisted brakes has a leak, and that you should get your gas tank cap and fuel pump checked. Another possibility is that the fuel pump may be weak, and the cap on the gas tank may be plugged, not letting in air to replace the fuel used. These are just possibilities

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When I slow down to a complete stop, my 1999 chrysler sebring cuts off. Can you help me?


Possibly a transmission issue. The transmission has a "lockup" mode, where a clutch connects the engine directly to the transmission at cruising speeds. It is then supposed to unlock at lower speeds and for stopping. If it doesn't unlock, the car will stall at a stop. Try putting it into neutral (carefullly, so you don't go into reverse) as you slow down, if it doesn't stall out, it is most likely the transmission lockup mechanism.

If it stalls in neutral it is an engine issue. Bad idle control, bad ignition (it's easier to fire at high speed), bad fuel injector, bad air flow/pressure sensor... and more possibilities.

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94 Lincoln TC engine stalls when slowing/stopping


Most common cause of stalling for Lincolns in that era is the TPS (Throttle Position Sensor). It regulates fuel mixture, idle speed etc. A bad TPS will usually act up in one of two ways:
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  2. When warm, car stalls when slowing down (especially if AC is on)
As far as valve cover oil leak, it's a problem that should be addressed to keep oil from fouling your spark plugs but highly unlikely to be the cause of your stalling problem. Hope this answers your question. All the best.
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1 Answer

Truck dies when i stop or slow down


this may be the cause, try it and see if it helps, it is a very common cause of problems like yours.
Here is the most common cause of surges and stalls and low idle rough idle, it is the idle speed control air-bypass valve and throttle valve (IAC for short), they get full of gunk over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

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