P0305 and p0200 on a 2003 chevy blazer 4.3 , runs really rough

SOURCE: have code for cylinder #1 misfire on 96 chevy

these were bad for the spider injectors to fail. they are hard to diagnose with out the scan tool. the poppets in the end of the injectors get clogged and will need to be replaced. pull the plug and see if its oil fouled. they also have a problem with the #1 cyl getting out of round and oil fouling the plug. compare it to another plug in the engine. if its oil fouled the engine is no good.

SOURCE: 1995 chevy blazer running bad shooting an EGR code,

Hook up a fuel pressure guage. Now with the key on and engine off does the fuel pressure come up fast and hold steady at a fixed value?

SOURCE: 1997 chevy truck running rough

Is this a 5.7? They are notorious for intake manifold gasket leaks. When mine did it, the diagnostics blamed it on an ignition misfire also! Replaced the gaskets and it runs smooth!

SOURCE: 2004 chevy 2500HD Truck OBD2 trouble code P0101

Hello and welcome. this code P0101 indicates a problem with the mass air flow sensor. this usually requires the replacement of the mass air flow sensor. but there will be a few checks to be made before the sensor can be condemmed

SOURCE: 1997 chevy blazer gets a

p0300 is an engine misfire detected p0301 would be misfire detected on #1 cylinder and so no throught p0306SOo seeing its not related to any one cylinder i would check the crank shaft position sensor first because that and the cam shaft sensor is what detects all misfires Itcould also be caused by any of these sensors TP MAP IC VS ECT throttle position -manifold absuliute press -idle control -vehicle speed -engine coolant tempature By the way are you getting any codes or is your mil light on if so you should read the codes thatcould tell more then any one on line good luck