1996 Mitsubishi Mirage CHUGS AFTER U HIT THE KEY

I bought the car after the timing belt snaped, some one put one on, it wouldnt start. They sold it to me, I pulled the head off 10 bent valves. Had that taken care of new head bolts, valves, timed it put all back 2 gether an wont start. Checked injector pulse, fuel presser, compresion, spark jst chugs or almost tries to start after u let off the key. Doesnt seem to throw spark untll 3 or 4 sec after u hit the key. Paid to shops to tell me they don know. Please help