So my car has been on jackstands the majority of time I've had it(3 months), I thought I got all the timing figured out, it idled great and revved fine. Finally took it off of jackstands to move and maybe drive it for the first time the next day, put it in gear and gave it some gas and then it immediately started misfiring and wanted to die. I bumped up the idle speed to keep it from dying and figure out why its misfiring. It's constant, not erratic. It was too dark last night to really do anything but I thought maybe you guys had some ideas and give me some time to think while I'm at work. It's getting gas. I just put gas in it last night because I had ran out. It feels like it's only running on 6 cylinders, I can feel the misfire when I free rev it in neutral. I have no clue as to what happened because it was fine. Only happened as soon as I put a load on the motor.

 

This won't solve your problem but it deffinatley help narrow it down. With the engine running be careful and pull each spark plug wire and plug it back in one by one. Turn engine off before putting back on btw. If the cylinder is firing right it should have a really bad idle but if you pull one without an incorrect fire it will stay the same. This narrows down the possibility. And check you have your firing order correct.

 

I'll give that a shot and see if I can narrow it down

 

Another thing is yours throttle body mpfi or tune port or even carb?

 

It's carbed. Edelbrock 1406 600cfm.