Ross gardiner Posted September 3, 2014 Report Share Posted September 3, 2014 hi guys im having misfires under load seems like a rev limit Car runs out to rev limit under light excelleration easy and no problem but under load and when it reaches high boost it falls over, replaced plugs checked spring pressure thought i tmight be holding the valves open but no.all this at about 4800rpm, only change is a cam replacement but i did have to dismantle engine but cause its runs fine just not under load n full boost Quote Link to comment Share on other sites More sharing options...
Simon Posted September 4, 2014 Report Share Posted September 4, 2014 Hi Ross What is the engine? Is it coil on plug, distributor or wasted spark. Do you see and trigger errors? Quote Link to comment Share on other sites More sharing options...
Ross gardiner Posted September 4, 2014 Author Report Share Posted September 4, 2014 its a valiant. no trigger issues got 120pounds spring pressure found a cracked spark plug but still goes the same .is mint at idle n driving but when getting up to full boost and load it falls over . i have an edelbrock air only throttle body with a gm iac valve that plays up i get sticky idle .has anybody had boost move the valve open ? im only running 14psi boost! after sone time or if you turn the ecu off and reset it  it goes back to normal idle Quote Link to comment Share on other sites More sharing options...
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