got truck scan for codes, and have 2 of them and they are po155 n po300. i just finished doing a complete tune up and truck still has a miss. need help bad.

 

P0155 - Heated Oxygen Sensor Heater Circuit (bank 2, sensor 1)
P030x - Random/Multiple Cylinder Misfire Detected

 

yeah i know what they are. but i just did tune up and replaced ign module coil and checked every vacuum line and sensors. but still has miss?

 

Did you notice that what I posted was links??? Links to the actual diagnosis for the codes you have... Cause if you have done everything that is listed, you would have found the source of the problem and repaired it by now.

 

ok sorry didnt know they were links. thxs

 

I had the same problem when I fixed my lower intake last year. I replaced the spider and after the new one was all tucked away and the truck was runing I noticed that a pins was bent on the old one. I'd check them quick so you can rule that out if anything.

 

how do you check the pins on spider?

 

Remove the electrical connector and look at them...

 

is that the main harness wth all the pins. or is where the fuel lines go into manifold?

 

I belive it is right in front of where the fuel lines go into the spider. It should have a blue pin that holds it in that you have to remove to get it off just be carefull and pull it straight up. Then look to make sure you dont have any bent pins in there.