Question about 1996 Chevrolet Suburban

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Random misfiring on pistons on a 1996 chevy suburban

I have a 1996 chevy suburban with a vortec v8 interceptor engine. i have been using the new fuel cleaners that are added to the gas mixture when it is pumped from the fuel pump. the second full tank of gas was pumped and a week later my burban started having the check engine light flashing. the engine at low speeds was missing badly. when i had the diagnostics on the engine done they said the code was random misfiring on the pistons. at high speeds greater than 60mph the problem seems less severe. since i had not had the spark plugs and wires changed since i purchased the vehicle new in 96 they suggested we start at that. we replaced the plugs and cables, but the problem at low speeds is almost as bad as before... but at high speeds it is not as bad as before. i started using the engine cleaning solutions that they add to the gas at the pump two tank fulls before this problem started...any ideas where we should go with this.

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1st thing to check is the intake manifold for vacuum leaks, also check and make sure the EGR valve is not leaking when it is closed, to check the intake buy a can of carb spray and sray around the top of the engine, if a leak is present there will be a very noticeable change when the spray is near the vacuum leak. To check the EGR Valve start the engine cold, wait a minute or 2 then spray water on the EGR, if it steams up the water it is leaking exhaust into the engine, this will cause a rough run as well.

Posted on Oct 14, 2008

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