choking/bucking under boost

O.k I've had so many problems with the car since I got it... nothing pocket deadening... but my knucles are plenty cut up

I'm starting to think that maybe my timing may still be off. I adjusted it a few days ago but I have a few questions.

1. If timing belt jumped a tooth, will resetting the timing at the crank do anything?

2. how much do shops typically charge to change a timing belt

3. what else could cause the car to buck when boost comes on, you can barely feel the boost but the car starts to shake, and act almost like if its going to stall under boost...

also the car feels incredibly slow when off boost, i mean I know its not supposed to have incredible low end power... but the car almost feels undrivable... sometimes I am afraid to make left turns on 4way lights because i'm afraid the car wont pull or will just crap out on me halfway. I'm really concerned, I've invested so much time into the car and a little over $1,000 in repairs so far...

4. could it be something more serious such as a blown hg, or maybe extremely low compression? When I adjusted the timing it was off 5 degres... and the car ran a little better after that but still noticeably slow.

Car is 100% stock besides a stage 4 turbohose kit. also waiting on toyota to get a new VTV as right now I am running w/ a one way valve that a friend gave me.

Can someone help me calm down before I have a nervous break down and sell my car

Forgot to add that all ignition components have been replaced.

oh yeah, car is running very ritch... you can smell and see the gas burning up

Thanks.