I HAVE A 97 NEON 5 SPD I UPED THE TB FOR FOR THE ATX TB.NOW TWO WEEKS LATER I'M HAVING IDLE PROBLEMS ONLY SOME TIMES AND
WHEN IN FIRST GEAR AND I'M FLOORING IT SHE HOLDS ON ME THEN ACTIVATES LIKE AN OVER DRIVE . I'M STUCK I HAVE NO CODES PRESENT AND SHE'LL ONLY DO IT ONCE A DAY IN THE MORNING OR AFTER A LONG PERIOD OF IT BEING OFF..[sm=confused06.gif]

 

Could it just be that the car isn't up to operating temperature yet, you are flooring it while the PCM is in cold-start mode, and you are flooding it for a second?

 

has any one else had problems with a bigger tb.....i have a 55 tb from modern performance...i got the mpx 55tb and i was wondering if i had to bore the intake manafold for a 55