Ok, the cap, rotor, wires and plugs are all new so I suppose it would narrow it down to the belly pan gasket. Assuming this to be the problem and causing a lean condition would that only cause it to run lean when decelerating or coasting? I ask because I just had it smogged (CA new dyno smog) and it passed perfectly fine, but the catalytic converter is fairly new. It was replaced the same time as the cap, rotor, wires and plugs. Actually, it never did this before I replaced everything. The converter is a high flow Carsound model. Could that possibly just make it more apparent due to the loss of backpressure? Thanks again.
David
>
> it could have sucked the gasket in on the belly pan and is allowing air to
> create a vacuum leak. this could create a lean condition contributing to
> deceleration backfire......
>
> The first thing I'd do is swap the cap and rotor, check the plugs for a lean
> condition, and see if the wires need replaced......electrical misfires can
> cause backfires during acceleration and deceleration
>
> if it's running lean that will surely cause the backfire too.....there are
> other causes too, but these are the major culprits.
>
> Ron
> 01' Dakota Sport 3.9 4WD
> http://www.scsilverdak.1colony.com
>
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