Question about 1998 Mercury Mystique

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Car will not idle, will run perfect at half throttle

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Tps throttle position sensor hope this helps

Posted on May 09, 2010

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Posted on Jan 02, 2017

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1 Answer

Tecumseh OHV175 204803A wii not run with throttle wide open


May have something to do with throttle body or throttle body sending unit. Could have something to do with fuel pump or fuel filter.

Aug 05, 2017 | Cars & Trucks

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2002 jeep liberty wont stay running at low ideal


Your throttle valve and idle speed control valve are sludged up. here is what you need to do to correct this, buy a can of CRC brand throttle valve cleaner, spray it into the running engine while holding the throttle up so it will not stall, use up about half the can, then spray and stall the engine out, let it stand for a few hours or overnight, that will let the cleaner soak the sludge and it will free up the system to properly control idle speed.

Apr 19, 2017 | Jeep Cars & Trucks

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Engine will not run at idle, however it runs perfect when throttle is applied. check engine light is not on and there are no codes.


You can try to clean the throttle body.
Put new Idle air control actuator.
New air mass sensor.
New coolant temp sensor.

Jul 01, 2014 | 1999 Lincoln Town Car

1 Answer

No power bogs out spit and sputters under throttle but runs perfect at idle


sounds like a vacum leak or the throttle position sensor im not 100 percent sure but that what it sounds like to me

Jul 25, 2013 | 1999 Ford F350 Regular Cab

1 Answer

Idling is going down if A/C is running


Do the throttle body cleaning and re- learn the idle speed control.

May 25, 2012 | 2009 Toyota Yaris

1 Answer

2001 taurus dohc codes 171 and 174 replaced MAF, DPFE and IAC. New plugs and wires cleaned throttle body and egr valve. Has high idle, surging on highway. Disconnect the IAC and it runs perfect,...


There is a large vac line coming straight down from the throttle body that goes to the PCV system. See if it has a hole in it. It is likely sucking air.

Jul 17, 2010 | 2004 Ford Taurus

2 Answers

Idle get very high when turn on AC.


Is these a carburated engine or fuel injected?If it is a carburated,look for adjustment on the throttle,near the linkage,back it off the throttle until desired rpm.

Aug 07, 2009 | 1986 Chevrolet Sprint

2 Answers

The car runs perfect, but dies at idle.


remove & clean your IAC motor & see if that doesn't help. If it cures it for a while then does it again, replace it.

May 11, 2009 | 1997 Mitsubishi Galant

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