Cold weather idle issues '90 k1500 5.7L

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Cold weather idle issues '90 k1500 5.7L

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Chevrolet Forums >> Chevy Trucks, Vans & SUV's >> Silverado >> Cold weather idle issues '90 k1500 5.7L

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Cold weather idle issues '90 k1500 5.7L - 11/17/2007 1:06:21 PM

wrkinprogress

Posts: 7
Joined: 11/17/2007
Status: offline

My pickup has a new Holley TBI unit, and has had prior idling issues, which turned out to be the TPS. After replacement, the truck ran like a top until cold weather. Now it tends to idle either too high(900rpm) or too low(500rpm), depending on what mood she's in. It drives me nuts, because she's also a stick, and that can make take off tricky at times. This problem is also amplified when the defrost is on. Once the A/C compressor kicks in, the idle increases then levels off, as it should, but after the first cycle it just bogs the engine down to 500 rpm or sometimes kills it. I think it might be the IAC, but I was hoping for advice before I started just replacing stuff.

Thanks.

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1990 K1500
350ci, 670cfm
Holley TBI, 5-spd