ok so i have a random problem in my 02 1.8T Jetta. when i start and then take it for a spin it hits 10-11psi then drops back to 9ish, which i assume is normal. when i drive the car for any distance it will randomly start to run only like 4-5 psi. there is no CEL. i can then turn off the ignition and start it again and all is well. i dont mean let it cool off or anything, often i do it as im driving down the road just click it off then back on real quick and suddenly its back to 10ish psi like nothing ever happened... i dont want to take it to a dealer but i may have to. i also dont want to get my ECU chipped if there is a problem that would be covered under my warranty.. any advise would be appreciated.