PAUL ARE YOU SURE ENGINE IS COMPLETELY STOCK? HAVE YOU DONE A COMPRESSION TEST TO SEE IF ALL CYLINDERS HAVE GOOD COMPRESSION? WHAT IS TIMING SET AT? WHAT KINDA FUEL 87 OR 91? COULD BE ONE OR ALL OF THE ABOVE, BUT THESE ARE THINGS TO CHECK BEFORE YOU TAKE ENGINE APART. I WOULD DO A COMP. TEST AND LEAK DOWN TEST AND MAKE SURE TIMING IS RIGHT BEFORE GOING ANY FURTHER.