Re: muffler backfire
It could be a few things. Too lean of an idle circuit can cause decel popping from opening up your exhaust without compensating on the fuel side. Unburned fuel igniting in the exhaust can cause backfires through the exhaust. However, if you are hearing something at idle than it is most likely air being pulled in from an exhaust leak.
Dart 400-AFR 195-224/224 HR-Powerjection III TB with F.A.S.T. Sportsman XFI
TKO 600-Moser 3.42-Detroit Truetrac
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'69 Camaro Beater-SFT 327-M20-Moser 4.10-sold
'02 Z/28 vert-stock-sold and totaled