I HAVE A '95 MALIBU RESPONSE, HAS THE 350 MAGNUM EFI S/N 349443 RUNS OKAY WHEN COLD FOR ABOUT 5 MIN. AFTER A FEW MIN IT STARTS TO CUT OUT ABOVE 3000 REV IT THEN GETS WORSE, CUTTING OUT AT LOWER RMP. SOMETIMES YOU CAN DRIVE FOR AGES AS LONG AS I KEEP UNDER 3000 REV BUT OTHER TIMES IT CUTS OUT AT...