The_Gear email@example.com (Steve Cook) wrote in message
Most likely you have an exhaust leak somewhere such as head/manifold
or manifold/exhaust pipe flange, also I think this P/U has some major
exhaust air injection plumbing on the manifold with the reed type
valve units on the secondary air pipes. If so plug or crimp these
hoses temp. to see if this stops the backfiring.
In short if the thing runs good but backfires the exhaust system is
sucking air in somewhere.
If it backfires and runs bad then look at ignition first then mixture
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