94 z28 - 30,000 miles

i just installed a s-trim blower, 42lbs injectors-computer tune-255 fuel pump,msd btm unit. First the car has been sitting since march- torn it apart and installed 1.6 rockers and ended taking them back out for the stock. the car was torn apart for months until i read up on parts and got time to install the blower and parts needed with it. the gas is the same gas from september and stable was added to the tank. drove the car three times in march and it has a half tank now. thought i needed a new starter but the msd box wasn't hook up right and the car didn't start so right away just put another starter on. car takes way to long to turn over?? before you didn't even have to turn the key all the way just tap it on vroom. whats the deal with that? i also installed accel 8mm wires and NGK tr6 plugs and was told to gap them to 0.035... also my check engine light is on? car idles perfect... when you first give it gas it holds back? new fuel filter added.. then after like three times of kinda spiking the gas then it fine. now my thought and my buddies who has built motors thinks the gas deal and the fact of the car sitting for so long is way the gas pedal is acting like that. car needs to be ran pretty good to blow carbon out. also maybe mositure got into the tank? also boost guage dosen't work? why is this? please give me some idea's guys- i want to drive this bad boy... thanks