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Idle cycles b/t 750&400

It's a 93 GT. At idle, when warm, the RPM will drop from ~750 to ~400 and then cycle between those. If in neutral, up to 2000 rpm, it will cycle as well, but only about +- 150. At 2000 RPM, ~55 mph it will lurch on occasion as if the transmission slipped. When driving it bogs as if I tried to start it in second gear(it's an auto). I think it may be the MAP or throttle position sensor any thoughts?

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6ya6ya
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Posted on Jan 02, 2017

Lloyd Six
  • 560 Answers

SOURCE: First started with idle droping to stall. Now the

You are on the correct lines, try spraying penetrating fluid into the valve, sounds like the valve is sticking. Maybe need to replace the valve.

Also check for air leaks on the inlet side of the engine, air leaks cause revving issues. Easy way is spray a fine mist of easy start over the inlet, if the revs race up then you have a leak or pipe off.

Posted on Nov 20, 2009

  • 90 Answers

SOURCE: Idle up and down when Neutral

Hi
The clutch perssure plates seems worne off. you will have to replace them .
You can start by adjusting the clutch setting ...drive for a few days and if still problem persists then go in for a pressure plate change..
Regards
Berry

Posted on Feb 02, 2010

  • 23 Answers

SOURCE: I have a 2006 PT Cruiser. When starting in the

If you go to advance auto they will scan the car for free. if you write the codes down and update your question it will be easier to eliminate some of the sensors.

Posted on Feb 02, 2010

warlock61
  • 659 Answers

SOURCE: my 1999 ford explorer won't idle when in gear.

check the idle air control valve at the intake manifold. its a silver valve on top try tapping it with a hammer and see if it idles

Posted on Jul 16, 2010

alicantecoli
  • 22125 Answers

SOURCE: Engine idle problem. Range Rover 4.6 HSE 1998 Have

sorry but you have tried everything i would have done except that i would have checked the engine breather pipes for deterioation like perished or soft and collapsing .you would be surprised how often this is the main cause of this sort of problem

Posted on Aug 21, 2010

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