1995 Chevy Impala missing at idle

1995 CHEVROLET IMPALA
64,000 MILES • 6 CYL • 2WD • AUTOMATIC
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1995 Chevy Impala mileage: 64,000. Help!!!! My impala is sick, I have just had the timing chain, distributor, replaced, also a second set of plugs and wires. My husband the back yard mechanic also added gas cleaner, thinking that I had gotten some bad gas. The car was running better, the main problem had been the distributor, but now it sounds like it is missing when its idling, and it is making this loud noise like it has an exhaust leak. Could all that stuff he added to clean the gas caused damage to sensors, or the catalytic converter. What do I do?
Jan 7, 2011 at 11:37 PM
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The wrong gas additive can cause damage to the oxygen sensor and/or catalytic converter. Check the catalytic converter to make sure it is not “plugged” or restricted. Your car is equipped with a computer controlled engine management system. An independent auto service center can scan your computer for fault or error codes. The information should pinpoint the malfunctioning components.
Jan 7, 2011 at 11:39 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.