I have a '67 Mustang w/ 289 - originaly a 2bbl/Auto now a 4bbl, 4bbl heads, headers and pertronix electronic ignition module (no more points). Ran great for a long time but now backfires at idle and during decceleration. I've replace the carb, coil and checked timing and carb adjustments - still backfires out the exhaust (sounds like my mufflers are gonna blow out!). It's a beutiful convertible and i'd like to get it running good again - any ideas that might help figure it out?
Thx.
PS: anybody know what this car might be worth?
Thx.
PS: anybody know what this car might be worth?