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misfiring can be many things, least of which would be a intake gasket. sparkplugs, sparkplug wires, coil, fuel injectors etc. if the check engine light is on then take it to an auto parts store and they can read the code and tell you exactly what it is
Misfire reasons.
Bad ignition coil (there are 3 of them), bad spark plug, bad spark plug wire (most common) defective fuel injector, intake manifold vacuum leak, low cylinder pressure due to burnt valves or scored cylinder walls.
P0300 random misfire, slight rough idle good , by the way your repair is good you dont want a identified misfire, Lets start by what it is not. Not a misposition sparkplug wire you would of gotten that cylinder code, as misfire, Oh try this got carburator cleaner? spray safely along the intake gasket, How about inspecting the vacuum hoses especailly at the map sensor. Here the thing you got. a vacuun leak. on a 5.7 a vacuum leak causes random misfire, by definition P0300 means 2 cylinders or more. By experience its a vacuum leak
could be a fuel problem or a fuel injector. these engines are also bad to leak water at the intake manifold gaskets, if coolant leaks internally it would kill the spark and cause a misfire. if its not low on coolant though i'd keep checking fuel and fire
CHECK IT FOR VACUUM LEAKS. INCLUDE THE EGR VALVE, VACUUM BOOSTER, INTAKE GASKETS, ETC. ALSO CHECK THE THROTTLE BODY IT MAY BE HELD OPEN BY THE THROTTLE CABLE.
A P0300 code is a random cylinder misfire code and could be caused by a bad plug, plug wire, or fuel injector. The P0171 is bank one o2 sensor is reading lean w/ both of these combined could mean a vacumm leak.. Hope this helps.
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