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was it running this way before you changed the plugs? just a shot in the dark here possibly a defective spark plug, rare but not impossible. if it was running fine before changing them. Other wise I would take it to autozone and pull codes if it is P0350 #5 misfire we would use the process fuel, fire and compression. is there any engine coolant around any cylinders? Have you checked the coil packs? could be a bad coil pack. if no evidence of fluid around them proceeded to check for spark, fuel then compression. post back results or new post with more deductions. iis it no spark no fuel or bad compression.
If you are saying everything is ok when the engine first starts but number one starts to miss when at operating temp. Sounds like the number one coil has developed a internal crack that opens up when hot or at operating temp..causing a miss.change it.but before changing the coil check the spark plug wire it may be breaking down when hot..good luck
cylinder 1 getting too hot causing ceremic crack could have wrong heat range plug in which spark plug too hot.or need replace spark plug wires.one plug wire could be bad best replace all spark plug wires.
The spark plug wires might be bad, Are the coil packs a wires together in one? With the engine off, loosen each plug wire so as to when you start it you can not have to battle with it First do this with dry floor, rubber sole shoos and a pare of rubber or vinyl gloves. As its running pull 1 plug wire off at a time. When you get to a plug that doesn't change the sound of the motor you've found your miss. Did the CK engine light come on?
Try this, wait for the dark of night. Start your engine ,open your hood and look closely at the spark plug wires. If you see sparks jumping over and across the wires change the spark plug wires. They are probably old and worn. While your at it change your spark plugs. Your car should run one hundred times better after this small and easy repair. GOOD LUCK.
Spark Plugs ---change at 70,000 miles
O2 Sensors--change at 100,000 miles (front 2 only)
Gas Filter--every 3 years/30,000 miles
Air Filter ---every 3 years/blow off once every year
MAF Sensor---Clean once a year or more often
Ignition Coils--- most definitely will go bad,at
least 1 a year. (Any Check Lights or Codes ? )
When cold, it isn't in closed-loop, and runs on
Long Term Fuel Trim--not on O2 Sensors ,until
Let it warm up at least 4 minutes in cold weather,
go light on the gas for first 2 miles
Spluttering and missing is usually one of two things Fuel or spark ?
Fuel problems will be traced to 1/ in line fuel filters .. 2/ tank run low on petrol throwing dirt and grit into tank filter ( if Fitted ) and blocked or restricted injectors a good fuel additve sometimes cures that problem , but replacement is a far better option .
Poor spark plugs breaking down under preassure oiled plugs due to overfilling or incorrect fuel mixtures .. poor or cracked distributor caps dirty or damaged rotor arms in said cap .. leaking HT leads damaged by rubbing and contact with hot engine causing sparks to fly to nearest earth disrupting the spark and ignition timing ... hope this helps Regards vortash