Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!
2006 Chevrolet Truck Colorado 4WD 3.5L engine stalls or dies
How long has the vehicle had the misfire?
If it were a bad coil it would most likely be cylinder specific.
Does the stall happen only when the engine is hot? And when it does will the vehicle start and run?
Do you have live data or a fuel pressure gauge? I’d start with fuel delivery.
Making Pressure Differential Sensors (PDA Sensors) for pressure pulse diagnostics.
Currently servicing Central Texas.
A single cylinder misfire is not likely to make the engine stall.....
Could you share the freeze frame data and elaborate on the conditions when the engine actually stalls, please? Do you know what goes missing when stalling( do you suspect spark and hence the original question?)
Will it restart easily?
An expert is someone who knows each time more on each time less, until he finally knows absolutely everything about absolutely nothing.
Gm has tsb relating to carbon buildup on valves. Get some techtron total fuel system cleaner put in 1/2 tank. Also works well on injectors.pull and check plugs. Carbon would cause high compression and lean condition. If you had a scan tool to monitor your fuel trims under load.
P0455 is an EVAP code for a large EVAP leak. the P0300 random misfire can be related to the EVAP problem. the stalling problem is a symptom of an EVAP leak as well. a purge solenoid opening can stall the engine. I would resolve the EVAP problem first.
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Being wrong doesn't bother me, it's being right and not understanding why that does
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