1st check the spark plug, make sure the electrode didn't brake off and it is clean and properly gapped, next check the plug wire make sure it's not broken or arcing out. If the wire appears ok change it anyways, it could be broke where you can't see it. If those two checks don't cure it , remove the injector elec. connector and see if it changes the performance of the engine, if it changes the performance and it runs a little more rough, the inj, is good, if no change to the performance the inj. is bad.
Trouble code P0301 means: Cylinder 1 Misfire Detected
If the check engine light is blinking that means an engine cylinder misfire has been detected
If the check engine light is blinking that means that an engine cylinder misfire has been detected
P0300 = Random/multiple misfire detected
If the check engine light is flashing at 1 second intervals , an engine cylinder misfire has been detected
cylinder 4 misfire detected code p0304 will not pass emissions test want do I need?
A cylinder misfire can be cause by a bad spark plug or a bad fuel injector. Replace the spark plug to see if the problem is corrected.
Trouble code P0301 means:Cylinder 1 misfire detected
when cold runs fine holding tack at 2500 rpm then clears cylinder
On a 1997 Ford Ranger , 4.0 liter V6 P0304 means that an engine cylinder misfire has been detected on the # 4 engine cylinder firewall 3 - 6 2 - 5 1 - 4 front of Ford Ranger ( V6 engine )
Bad plug, plug wire, burnt valve, blown head gasket, on that cylinder.
Trouble code P0304 means:Cylinder 4 misfire detected