Need Help!
Since I can't create a new thread for some reason, I'll post it here for now:
Tonight on the way home from a co-workers house, my car decided it didn't want to run properly anymore. I was in 4th gear, at about 3k. I punched it and the car started to pull, and then immediately bogged. Nothing out of the ordinary, or so I thought. I got off the gas and tried to give it partial throttle, and the car just bogged/sputtered, and then died... I started the car back up, while coasting down the road. I pulled into the gas station as the car stalled again. Parked, I started the car and then it idled rough, and then died.
I have no check engine light, no holes in my block, no oil on the ground, oil level is fine, coolant level is fine, the car is getting fuel and spark. The intercooler pipes are intact, have no holes in them, and are tightened down 100%. Nothing is loose or disconnected in the engine bay.
I let the car cool down for 20mins while I wait for my buddy to come pick me up/ give me a hand. When he arrives, I start the car back up, and it does what it did before: Rough idle for a few seconds, and then dies. So I start the car back up again, and slowly give it gas. I was able to slowly throttle the car, and keep it running at any RPM. I rev'ed it up to 3K and just kept it there for 30seconds. Then I went back down to 2500RPMS and kept it there, and then went up to 4k RPMS and kept it there as well. Once I let off the throttle, the car dropped to idle, started running rough, and then died. So, I started the car and immediately gave it gas. I started doing what I was doing before, and slowly brought the car up to 3k RPMS. Then, I decided to try to give it heavy throttle. The second I did that, the car immediately bogged/ hesitated and died. I tired this several times, and each time I had the same results.
To me, it seems that the car will run fine at any constant RPM, under zero load or full vacuum. The second I tried to bring the car to zero vac, it would hesitate, start bogging, and then die. It's almost as if it senses the car is getting close to boost, and simply dies. What doesn't make sense, is that the car still idles rough and dies at idle, where vacuum is usually the strongest.
My first thought is that the turbo or wastegate has failed. This would kind of explain why I would be able to slowly bring the car up to a certain RPM, but the second I close vacuum or start building boost, the car goes haywire.
My next thought is that the MAF is bad.
My third and final thought is that the MAP sensor may be bad, but everything I have found on this forum says that I should have thrown a CEL if that were the case.
I have no CEL what-so-ever. My mods are a catless midpipe and 626 manifold, that is it. I am in the process of going back to stock.....
Any ideas?