Car flooded real bad. I finally got it running and as soon as it starts to boost it shakes and bucks real bad until you let off. It doesn't matter what RPM or gear. I got it to about 5k under no boost but as soon as it sees boost it goes crazy. It idles fine and runs fine until it sees boost. Its pulling 14 in vac at idle. Compression test said mid 5's consistently all around, using modified piston engine gauge. How bad is that?

I checked all connections at tps boost sensor etc found nothing loose electrical or vacuum anywhere.

Could it be bad/water in the gas? Could the cat be clogged? I can hear a slight rattle under the car from that area. The car has been sitting for about 2 months. It ran fine before 10-8-10 boost etc.

What do you guys think

 

I know it sounds like a stupid answer...but did you change the plugs...they could be fouled. In extreme cases you may need to try the ole ATF trick....although lasttime I was flooded I just need to pull the plugs and crank the car over a few times....

 

did atf trick...it started.
pulled the new plugs for compression test and they werent too bad