hi i have a 94 chevy Astro van awd 4.3 v6 and its backfiring through the intake only when you start going up hills is the only time is does it. I changed the spark plugs, wires, cap,rotor, and coil. check engine light is not on. any suggestions
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HI,There is a TSB about the ignition module that will cause backfiring we
replaced it on my sons 94 s10 and that problem went away,now we are trying to bucking from i believe fuel starvation,but there is not a schrader valve on this year truck to check fuel pressure with a gauge.