ive got a 4agte it was cracked on the intake manifold and was free reving on start up, i took it off got it welded up put it back on and now it wont idle at all, it starts and dies straight away, it has a autronics computer, i need to get it fixed as i want to race at heathcote on sunday. if it does start sometimes once u try to accelrate it dies it doesnt rev at all.