Well took the intake manifold off today, and there is tons of carbon buildup in the throttle body, and air box on top of it.

My friend got the tention bolt off yesturday, and did the timing right (I think) again, But since the new fuel filter, It starts up at about 300rpm, and goes up to about 1500 and then drops back down to like 800rpm, and does this a few times before it just stalls, and this is full throttle mind you.

Could the timing be off 180 degrees?

I'm still really confused, Getting plently of use out of our new air tools though.