FINDING THE PROBLEM
1989 Chevrolet Van • 300,000 miles
I have a Chevy G20 Van 1989. The problems seems to be: Sounds like it is burping or coughing air up and out the carburetor, the Idle sometimes slows and stalls. Runs fine at normal speeds and coughing sometimes is not present. But when slow to Idle that is when the coughing sound begin the Idle slow the vehicle may stall The Map sensor and throttle position sensor has been replace.
when was the last time you had plugs, wires, cap, rotor and filters changed??
The Plugs and wires, cap and rotor and filter may have been changed about a year ago I think . Key point when I changed the map sensor and TP sensor It ran fine and the problem was gone for a day but re-emerged.
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