well the reason for this topis is because i've replace my intake and exhaust. car's been shaking so i've replaced the sparks you should've seen it it was blown. well i got all the connections right, check the pipe for leaks and they were all ok. but today when i was driving to work, when i get to around 45 mph, the idle starts to play around a little bit. like before it changes to the next gear it reaches around 4k rpm. but when i'm steady or on a stop there's no prob. hope you guys can give me a clue on what or where the problem is. well i'm about to get bigger maf converter. right now i have a 3" converter and be geting 3"3/4.