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Registered
Join Date: Oct 2008
Location: Nash County, NC.
Posts: 8,472
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Check your timing and timing advance
There is a VW relay under the seat available at auto stores for a few dollars, change it out. If relay is defective, it feels like a WUR gone bad.
Check pop off valve and make sure the rubber seal is in place.
Some things to start with.
Backfiring through the injection is usually a lean condition.
Unplug the oxygen sensor because it will override any changes made in the injection.
Bruce
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