Ken Shannon

NEED TO PICK SOME BRAINS.
START BY WHAT I DONE , 91 ROLLER BLOCK , HONED , INSTALLED SPEED PRO PISTONS, MAHLE RINGS , MOGUL BEARINGS , MELLING OIL PUMP , B303 CAM , WORKED GT40 HEADS, 1.6 ROLLER ROCKERS SVO , COBRA INTAKE , 70 mm throttle body , 24 LB. INJECTORS, BBK FUEL REGULATOR .
APPEARED TO RUN GOOD FOR A MONTH , RAN RICH THOUGH , AFTER TAKING IT TO THE REV LIMITER, STARTED MISFIRING INTERMITTENTLY. PULLED PLUGS CHECKED COMPRESSION, FOUND #5 HAD SOME OIL ON PLUG AND TOOK MULTIPLE CRANKS TO GET TO 120 LBS. SAME WITH #8 MINUS OIL , ALL THE REST AT 120 . DID A LEAK DOWN TEST 10 - 15 %. HEARD SOME AIR BYPASSING RINGS . DID A RUNNING COMPRESSION TEST ON 5 AND 8 WAS AT AROUND 0 -5 , CHECKED A KNOWN GOOD CYL . WAS AT 140 . WHAT WILL CAUSE THIS , I HAVE IDEAS , WHEN IT RUNS POORLY I GET INTO IT THEN IT SUDDENLY PICKS UP AND TAKES OFF , RUNS PERFECT THEN LITTLE BIT LATER LIKE CRAP , HAPPENS EVERYDAY, CAN GO INTO STORE COME OUT AND RUN GOOD . NEED SOME HELP , SORRY SO LENGTHY . THANKS A MILLION