I recently took a trip to California, when I got back I had to change out the exhaust/intake manifold gasket. After I put it all together, tightened everything down, the car started to run funny, well different from before. In the morning, I give it gas to go, and the car boggs down, like if its gonna die. Then when I'm cruising at a constant speed, I will press the pedal all the way down quickly and the car stumbles for a second. It still boosts the same, at 15psi., fuel pressure is the same, the blow off is not as loud anymore, before it used to blow off loud. The car still seems to have the same power, but it drives strange, the way the motor sounds is different. I checked for vacuum leaks, but dont find anything.
Please help me if you have an idea, anything helps. Thanks