Hi all, My 1999 GAGT 3400 has had a "bobbing" Idle lately, usally when I start it up (cold or Hot doesnt matter) it will "bob" between 500 and 1000 RPM and when I rev it up it usally stopps. I cleaned the IAC valve and reset the computer and that helped for a week or two but its up to its old tricks again. Any suggestions would be greatly appreciated thank you for your time...
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