I have a 2004 Tiburon 2.7 with about 128,000 miles. About 15k miles ago it had the engine replaced since it overheated and melted the pistons. The problem I'm having is that when I hot rod the car it starts running terribly. Usually it starts when running rough above 4k rpm. If you reduce the throttle and return to a lower rpm, it still runs rough until 1 of 2 things happens: 1) you throw the tranny into nuetral and turn the car off, then restart it. 2) you remain at an idle for a few minutes it will come out of it. I've replaced the spark plugs with the correct gap, spark plug wires, coil packs, and the cam shaft sensor and still have yet to solve it. Any ideas?
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