Hey I don't know if anyone here knows what the problem is, but I am having problems with my 03 Escalade with a Magnacharger. Sometimes when I hammer on the gas from standing start my Caddy hesitates to go and then starts reving up, reving down, reving up, and down.....and so on. Even if I punch it at 90km/h she will rev up and keep bouncing between 4500-5000 rpm without accelerating. I kept it at that for about 10 sec and that's all she did and didn't accelerate. I am kind of puzzled what it could be. If I don't hammer on it she will accelerate normally without problems.
What could it be? I thought maybe the fuel filter? My Caddy has about 100,000km on it. I don't wanna wreck anything.
Any ideas will help.

 

check your fuel pressure regulator....make sure the o-rings are installed.

 

I agree with fuel pressure related problems here. I have even seen that without blowers installed. I advise to run with a guage and read what it is doing at idle, at the point just before the hesitation and while doing it. Can't remember fuel pressure specs but I am sure someone here does. Then I guess go from there, starting with what blownchevy said.

 

should be no less than 58 key on engine off.

 

But it doesn't do it all the time. I guess I should of mentioned that. One day I drove to a Chevy dealership and it wasn't doing it at all. Figures.
The first day it started doing it I played around some transmission controller that was in the Escalade (i just bought it 2 weeks ago). It had these settings - Off, Standart boost, towing, and high performance. I thought it had something to do with the motor so I put it on the high performance setting and punched it. This is when I started experiencing this problem. That day it was doing it, but then stopped for a week till I just came to Las Vegas form Edmonton, Alberta.
I don't have a fuel pressure regulator installed yet. So don't know my pressure

 

Do you remember what it should be at boost levels?

 

I would still check fuel pressures, but could it be the tranny slipping?

 

60-65 under wot.

 

make shure all your spark plug wires are on proper as well...i had this issue the other day after tranny rebuild....would not go at all at wot but was kinda ok just cruising...almost sounded like a leaking exhaust gasket at wot....found plug wire on but not making contact on driver side...

 

I'll see to make sure the plugs are on properly. There are only so many things I can do while I am on vacation.