Hi I'm new to this so bare with me. My 99 gt seems to be running a little funny it kind of hesitates in the lower rpm's and doesn't fell as powerful as it once was. I recently change the oil and oil filter, cleaned maf sensor. I also installed a cold air intake system and a throttle body\ intake spacer and an air temp. Sensor chip. My car makes a kind of air release noise when I hit the gas. When I installed the c.a.i. I didn’t put the air filter on right at first so the car was sucking in unfiltered air for a few miles. Can anyone please help me figure out whats wrong with my car?