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Discussion Starter · #1 ·
I've got a '92 F-150 with the 4.9 (201,000 miles) and it just started this. After it sits all night or longer, when I first start it it will idle for a second or two, then the idle will tank and it will start coughing and sputtering. If I just tap the gas pedal it stops it and is fine intill it sits overnight or longer again. It doesnt even do it after sitting for 10 hours at work! I tested the IAC per instructions in a manual and it checked ok (oh ohms or resistance and was supposed to be between 7-13).
Any ideas?
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