Ok guys need some help. I bought this to put a trans in it. Got the trans in today and now its misfiring terrible on the # 4cyl. It seems to rev fine in park or neutral. I pulled the plug and it was pitch black. So i put in a different plug and no difference i pulled the valve cover and everything seems good there. I put the spark tester on and that seems good in park. Tommorrow im going to rent a compression tester. Only code its throwing is po304 or whatever for 4cyl misfire. So if anyone has any ideas id appreciate it. Its a 97 350 vortec injectors just replaced engjne overhauled bored .3 over.
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