Does the catalytic converter rattle? Use a broom handle to shake it.

Mine was doing the same thing, It ended up being the computer taking a crap

That car is STARVING. Fuel delivery for sure, check pressure, and check the FPR...if there is raw fuel in the vacuum line on the FPR its bad, at your mileage i would suspect pump/strainer assembly..

Pete...this is silly..you work at a dealership. What is up with the dealership guys?

Vig can't get a car running and he'* got tech'* to the left and right.. you can't test fuel pressure..but there'* probably 15 gauges in the building.

Almost sounds like my car when I had a miss. Ever check the coils?

if someone can supply me with a circled pic of which vac line to check i can go take a look (i have NFC of whats what when it comes to the vac lines )

I know it sound silly , but the techs for the most part dont like doing work for the guys that cant because they think that you only asking the to get a deal and there already starving for money :?
And like i sad this problem doesnt happen all the time and never happens when i go to or from work so i would be silly to try and find the problem when the problem isnt there

It might be the Ignition Control Module. They don't like heat, and when they go bad, they start to act up after temps under the hood heat up. I've seen it happen, and the car just totally craps out and feels like the motor hit a brick wall, yet it doesn't die. It would explain the randomness of your power loss, but I don't know how it would cause your loss of boost????

What year is your car? Series I or Series II
Check how tight your supercharger belt is. My friends'* L67 LSS had a slight, momentary loss of power under WOT, like a missfire, but it would catch 1/2 second later and continue to miss, then catch. Turned out his tensioner was really sticky. A little WD40 and he was good to go.

So, just pull strait out on your belt. If it smoothly comes out and returns to normal, its fine. It it creeks and sticks coming out and it hesitanat to return to normal, it needs some lube. Althought I doubt it'* the belt because your problem is so severe.


Also, let me try to explain there the FPR is. Locate the fuel rail. It'* the steel pipe that goes over the supercharger. It'* have four tubes running over the blower. Then there'* the section that goes across the each fuel injectors on the front bank. The regulator is about one inch around and located the left of the part of the fule rail running across the front fuel injectors. It should be under the three spark plug wires sunning the the rear bank of clynders. With the car running, pull the little vacuum line off it carefully so as to not crack it. If you see fuel come out, then it'* bad.

ON EDIT: From your sig picture, I see you've got a Series I. I have no idea where the regulators are on those, and you've only got one belt, but I'd still check how tight it is.

Blown..He has two belts. One SC and one accessory.

Pete.. if you have a multimeter, check the coils. See if they all read about the same. Let'* start there.

I checked my coils jsut recently, I had a starting issue and I don't kow how mechanically inclined you are.. I wasnt. Its easy. Good luck....

well i replaced both my belts with gatorbacks, and found that the tentioner for the SC is going bad the SC coupler is getting a little slopy, i also checked the fuel pressure and at idle it was at 39psi and with the vac line pulled it was at 48psi and there was no fuel in the vac line. but im not to confedent with those results because my car wasnt showing any symptoms before or during the test.
I do have a mulity metter but i dont know how to use it so can someone give me the run down on how to do that test?