MISS FIRE

[C-Lew]

Have 99 yukon old body syle, 5.7 liter with a magnacharger on it. It seems to have a miss fire at high rpm, like it fall on its face and does not want to go, have check and replaced plugs, wires and distrupter and nother same thing, dont know if I need a new engine model or what. Also check the programer that came with the charger seems fine. Started doing it a couple months ago. Truck only has 51 thousand on it and about 35 thousand with the charger on it, the charger is the old style non-intercooled. Help Please any suggestions help. Thanks

 

[GMCYukalade]

- Could be the O2 Sensors causing your problem - or the Dist gear.. - what type of plugs wires etc did you use?

 

[C-Lew]

Do you think that this would help?

1999 GMC Yukon - Crane Cams Ignition Control Unit
Part Number: C3060006440MFR#: 60006440Description:"CRANE CAMS HI-6 CAPACITIVE DISCHARGE MULTI-SPARK CD IGNITION -- Delivers Higher Spark-Gap Current, Multi-Spark CD For Race And Street Applications, With Up to 14.5:1 Compression Ratio, Nitrous-Oxide, Supercharged And Turbo, Delivers More HP, Torque, And Crisper Throttle Response, For 4, 6, And 8 Cylinder With Distributor, Includes The New Plug-N-Go Universal Harness, Bigger Rotary Switches With Precise Click-In Detents For Easy Rev Limit Adjustments In 100 RPM Increments, Built-In Tach Accuracy Check, Points, Module, And Mag Triggered, Fully Potted With New, Sift Urethane For Protection From Heat, Dirt, And Moisture, With Manufacturer's Limited Warranty"