my friend has a 94 teg, and he rencently change the clutch and pressure plate, he put in a act 4puck, it was runnig good for a while but now his car won't go in gear, he change the slave cylinder, but still problems, he has to cut of the car put it in first then start it up to drive it, he still doesn't kno wats wrong and somebody told he to change the master cylinder, anybody have any idea wats the problem?