I just purchased a 90 foxbody it has a few things i need to fix bit my main concern is the idle and backfire. it has a cam ( NOT SURE WHICH ONE) and a trickflow intake. It has a big loop on idle and it feels like it's going to shut off but it won't ( on some occasions when i slow down it will shut off) whwn i get on it it feels bogged down and sometimes it backfires. Now it does have a pretty big exhaust leak on the headers, would this cause the backfire and bogged down feeling? Also I'm about to replace the headers gasket and noticed it missing a bolt anyone have this part number for the bolts. What can i get to stop the bolts from backing out.