went to start up the truck the other day and it had a rough idle.... check engine light was on.... i just thought i had bad gas so i went and filled it up with premium.. half a tank later nothings changed... so i put new plugs, wires, distributor cap and rotor in, while i done this i unplugged the battery to reset the check engine light... i made sure that the wires were put in the right place, fired it up and it wasn't as bad of and idle so i took it out for a test drive and the check engine light started flashing.... and then went off... so i shut it off and started it back up and it stayed on, but when i give it hell the light starts to flash.. untill i let off the gas.... so i took it up to oreilly's and pluged in the code reader and it said cylinder 8 misfire... i cleared it and checked for good spark to all cylinders.... everyone was good.... pulled the plug on cylinder 8... it looks like its burning lean vs. the other plugs... I just thought it was something in the injector... so i put a can of seafoam in the tank.... only 1/2 of a tank was in the truck so it was mixed a little rich.....ran it around till i burnt 1/8th of a tank.... nothing changed, i don't know what the deal is... if an injector is bad but i keep running it around thinking there is something in it i will burn up a valve..... any help would be awesome... Thanks

 

Swap injectors on cylinders 6 and 8. See if your misfire moves.

What wires did you put on there? And by 'routed right', do you mean you followed the TSB for misfire?

Have you fixed your plenum yet? How many miles on the truck?

Welcome to the forums.

 

Before you swap injectors, play with the connector and see if the idle smooths out. The clips get old and break often causing a misfire on that cylinder. If the connection is good, do what HeyYou said and swap injectors to see if the misfire follows that injector.

 

The truck has 156xxx miles... by routed right i ment that i ran the wires so the engine will be firing in the right order... i believe the plug wires were omnispark... just the ones you bet at oreilly's

 

i check on injectors a few years back just to see how much they were and i think they were $80 Each then. i did a compression test on the cylinders and they all read the same so i know its not a valve... thank goodness...

 

156K? How long have you had the truck? Has the Plenum ever been done?

Pull your airbox off of the top of the throttle body, (engine off, of course...) crack the throttles wide open, and point a flashlight down there, see any oil? Need to yank the intake. This might be contributing to your misfire...... if the leak is bad enough, and in the right area. (no way to know that without pulling the intake though....)

 

Well my father purchased the truck back in 2003 with 42xxx miles on it.... he mainly drove it on the highway.... 200plus miles a day. and the previous owner was an older lady... he passed away and i got it...as far as the Plenum which i'm assuming that its the newer version of a valley pan.. (lol).. i have no idea.... dad never had it off.. it isn't burning oil... doesn't smoke when fired up cold... the truck only cuts out when i'm putting around... if i giver hell the miss clears up... untill i idle back down then it starts again...

 

no oil in the intake.... just looks like carbon build up... doesn't look anything like old oil.... so thats good

 

Have you noticed your oil pressure dropping below normal when your at an idle? If so, you may want to look into getting an upgraded plenum kit.

 

oil pressure is fine... stays between 40 and 60psi all the time...