Hi there is done had a bit of a search but can't find anything that helps me out. I recently purchased a toyota 4k and dropped it in my starlet. I'm having a problem. The car starts and idles fine but if I just step on the gas it's just backfires out the carby and exhaust. I can rev it up if I slowly take the revs up, but as soon as I try rev it up quickly it dies. I've checked timing and that's good. Any help appreciated.