I have a suzuki forenza 2006 it turns on and everything but it doesn't want to accelerate
have you done the routine timing belt change?>as noted by your maintenance schedule? something tells me your timing belt tensioner is loose and the wear shoe is worn...perhaps these are the cause...your timing belt needs to be changed and the tensioner bearing replaced~
if the belt WAS changed already would look to the TPS (throttle position sensor) these can wear out~
Might be the transmission range sensor. I had this problem with my forenza wagon and the range sensor needed to be replaced...found one on ebay for cheap.
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