Miss fire codes p0300,p0303
 

Was out playing today and got a misfire codes p0300, p0303. Did my plugs and wires when I bought the truck about 20,000 miles ago

"AND", what is your question, how about some help here like current mileage and what you have checked so far???????????????????????????

got 120,000 miles on it. Haven't checked anything yet I'm not sure what to go on because plug wires are still kinda new

Who's plugs and wires, what sort of gap are you running and what octane gas?

up here I put 91 in it and 93 at home. Plugs are ngk iridium, wires not sure I bought them at advance auto parts, might not be 8mm.

As always thanks for your help!

Wires would be the first thing you should look at, only consider something like STI or Magnecor 8 mm wires if you want them to hold up.

Getting a lot of codes 130,134, 171 and a 1171 all today and my car is running like ****.

Help!

I got plugs wires and coil pack on its way to the hotel today. Going to start with my wires but I'm thinking it's my coil pack since I'm miss firing on 2 cylinders. Didn't have time to order parts individual to troubleshoot. Will let you know

It was the plugs they look okay to me but I put new ones in and clear the codes it's running fine!