This is my first post. I'm new to the mustang world, i have a problem i hope someone can help me with. i have a 1992 5.0 lx with a 67mm turbo with a 44mm wastegate that bottle necks into a 38mm blowoff. the engine is compleatly stock with 42# injectors. When i bought the car it had the turbo on it. I had it tuned with a SCT chip. The first time i had it tunned i was running 10psi of boost. I had it tuned again a month later with the next size spring (the 13psi spring). at the dyno i was still pulling 10 psi. I took it to the track 4 days later, and it all of a sudden started runnung 11.5 to 12 psi. Now at full load the engine has a hesitation at high rpm's (4500 and up). I checked the plugs and there gap I gaped them at .034. The plugs where white like the car is running lean. I think since the boost went up the car is running to much air not enough fuel. if anyone has any suggestions on my problem please write back. i think i need to take it back to the dyno and have my fuel adjusted.