I'm looking for some help here guys. I recently changed head gaskets on my 89 350 and since then, I can't get the thing to run properly. Lately, she's been backfiring through the TBI and the exhaust. The rockers are tapping a bit. On occassion, I'll hear a loud,sharp, scary popping sound, like something snapping. She idles decently, with some backfire. Once she's put in gear, she sputters and dies.
Is this a valve problem? too tight/loose?
Or a timing problem?
Thanks in advance,