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Doug, I have the same problem in my '69 Westy when I abruptly let off the gas. Our mechanic told us that some PO had installed a deceleration (he called it a decel) valve(?). Instead of cutting the gas to the engine entirely the decel tapers it off (quickly, though). This is a lot easier on the engine. When the engine is even slightly out of tune it starts to pop when decelerating. When it gets way out of tune it turns into a full-blown POP POP POP - backfire-y sound. The bus is not FI, but maybe there's something similar going on... Our mechanic told us the decel was a good thing; but if it really bothered us, we could put a beebee in the valve to disable it (which we have not done - its kept tuned and we're used to the sound). Hope this helps... although probably not. Any one else out there know about these decel valves?? Emily '64 Notchback 1500S '69 Westy ---------- From: Douglas Henry To: type-3 Subject: Backfiring T3 Date: Thursday, November 14, 1996 11:12AM It typically happens in second or third gear when I am accelerating and abruptly let off on the gas pedal to stop or pause for something.