misfires on 1990 Cadillac Seville

My 1990 cadillac Seville will miss and backfire causing my muffler to blowout.i have have changed dist. and cap,dist.plugs,wires and coil.

by in Columbus, OH on October 30, 2010
1 answer
ANSWER by , October 31, 2010
Check your timing. Make sure that your timing is correct, also I would check the timing chain or belt, and make sure that it is not slipping causing your timing to come off.