hi there when i have a load on the truck the engine light flash and wont stop and when i put the coder on it and shows those codes
PO300 - Random/multiple cylinder misfire detected
PO302 - cylinder number 2 misfire detected
PO303 - cylinder number 3 misfire detected
PO304 - cylinder number 4 misfire detected
PO306 - cylinder number 6 misfire detected
PO307 - cylinder number 7 misfire detected

i tryed changing spark plug and wires and cap and rotor i still have the engine light coming on still i dont now what to do if anyone has ideas please let me know please and thankyou

 

Welcome to DF.

Could be any of a selection of things. Might be blown plenum, (it is highly likely this is at least a contributor) bad crankshaft position sensor, low fuel pressure, etc.

 

i had my crankshaft sensor change not even a year a go i been think about testing it or try a different one and see if it works

 

What brand sensor was installed?

 

im not to sure the shop i took it too replace it may be piston ring brand or napa brand im not to sure i have to find the bill will it make a differents

 

Possibly. Our trucks don't really like aftermarket sensor in critical places, and crank sensor is most certainly critical.

 

i was checking everything and i checked the ignition coil was putting out low volts and i change it and when i haul something or drive around daily i don't have the problem no more thank you guys for the help