help have a rly werid missfire?

Hi yes i own a 2003 4.8 silverado with a rly werid missfire i had the tech2 on it the 4 days ago b.c the check engine light was on and it idles rly rly weird when i stop. and a missfire code came up on #2 and i already replaced all the coil pack on it and did a fuel injector clean and new plugs and wires on everything so i have no clue what it could be theres only 100k miles on it. i heard alot about the intakes leaking could that cause just one missfire tho??? and its adding alot of fuel b.c of that so maybe i thought the pcv valve?? any ideas plz??!!!b.c ive just been :banghead: all day long about this.

and its adding alot of fuel b.c of that so maybe i thought the pcv valve??

Fuel pressure regulator?

Hi yes i own a 2003 4.8 silverado with a rly werid missfire i had the tech2 on it the 4 days ago b.c the check engine light was on and it idles rly rly weird when i stop. and a missfire code came up on #2 and i already replaced all the coil pack on it and did a fuel injector clean and new plugs and wires on everything so i have no clue what it could be theres only 100k miles on it. i heard alot about the intakes leaking could that cause just one missfire tho??? and its adding alot of fuel b.c of that so maybe i thought the pcv valve?? any ideas plz??!!!b.c ive just been :banghead: all day long about this.

another silverado had similar misfire problem no codes ended up being o2 sensor. you will need to measure o2 signal voltages and determine if this is the problem or since 100,000mi on vehicle o2 sensors are due to be replaced any way.....PCV r/r every 25,ooomi . I believe o2 because of rich mixture and misfire.

did a fuel preasure test everything showed that it was good and o2 sensors voltage was in normal operational parameters. thats y im thinking its intake but i have also sprayed carb clearner around the intake and watched the fuel trims and not much happend soo yahh?? thats y im kinda lost and had to check on here for any help.

did a fuel preasure test everything showed that it was good and o2 sensors voltage was in normal operational parameters. thats y im thinking its intake but i have also sprayed carb clearner around the intake and watched the fuel trims and not much happend soo yahh?? thats y im kinda lost and had to check on here for any help.


intake gasket took a fog machine to it today and found the leak!!

Good work my friend!!!