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1989 suburban staling when takeing off and lopes while idleing

I have a 1989 suburban 5.7 liter throttle body. it lopes while idleing and when i try to take off in it it stalls and i have to feather the gas to go. i have replaced the fuel pump and filter, the iac valve, the tps sensor, the plugs and cap, vacum lines, and the coolant temp sensor on top of the intake. i have swapped out the map sensor with on off of i car i have with a 305 to see if that would make it improve but it is still doing the same thing. need help im out of ideas .

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  • Christopher Walker
    Christopher Walker May 11, 2010

    how does the truck act when in park of neutral and you rev it?

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  • 65 Answers

Have you tried replacing the fuel pressure regulator? I had the same issue with my 1994 C2500 3/4 truck.

Posted on Nov 18, 2009

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Car lopes as soon as it warms up


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I got a Jeep Wrnagler 1989 5 speed 2.5 liters when it starts it idles high and idles real low


Seems like you got a fuel pressure issue.Bogs down in 3rd. .Then idle high and low.Also check the MAP sensor its up along the firewall.Make sure the hose and electrical is connected,

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Rough idling/loping at idle it otherwise runs fine off idle.


1. Vacuum leakage Check throttle body and intake manifold for tightness. check all vacuum hoses.
2. Faulty fuel or pump or electrical.
3. Plugged PVC valve.
4. Air filter clogged
5. Leaking head gasket.
6. Camshaft lobs worn.
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I have a problem with my1989 gmc suburban, the idle is set way too high ( apx 2700 rpm) where is the idle adjustment screw located on the carb?


there is no carb, and no adjustment. if it idles too high, there is a vacuum leak, so check the large hose going from the base of the throttle body to the valve cover. if thats OK, these are known to have a leak at the base gasket, usually at the rear of the throttle body. spray carb cleaner around the base and see if the idle changes, if it does, replace the base gasket.

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Having an idle problem...89 model suburban 5.7 liter with a throttle body...every sensor and switch has been replaced...the throttle body has been rebuilt and the fuel filter has been replaced...when it is...


Check your timing. With 5.7's from 1989 I have encountered slipping harmonic balancers, so make certain tdc is actually where your "mark" is, otherwise you'll get an incorrect setting and it'll run like ****. Depending on your mileage you may have a toasted timing chain.

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1989 pontiac firebird 305 v8 starts and idles


Your idle air control valve may be dirty or the wire harness may be damaged. First try cleaning the throttle body with throttle body cleaner and make sure you use all the can up and try to get the idle air control valve cleaned. A faulty or dirty idle air control valve will cause engine to stall when put in to gear from idle. Good luck and hope this helps. Keep me posted, be glad to help you get your car running 100% soon.

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1 Answer

Loping and high idle


You are really onto it! Either the TPS or the cable from the peddle. Do check the cable first. Frankster016

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