I have a 99, with a manual transmission, catback exhaust, cold air intake, and granatelli mass air flow. Within the last 5k i have replaced fuel pump, spider with regulator, full tune up( including coil and module), TPS, and IAC. It rans great for awhile then it seemed like it lost some of its power. I hear a loud popping noise when i have a cold engine (pops about 2 or 3 times), after that i dont hear it again until I start it up with a cold engine. Can anybody here help me in some direction? P.S. there is no check engine light or codes pending.