need help with freeze frame

[Crunchnmunch]

i recently purchased a truck approx 5 months ago and it has been hell. its a 2003 gmc sierra k1500 v8 4.8L manual reg cab long box 137000km. i have a hole lot of problems with it, so far i have changed all the brake pads, calipers, rotors, brake lines also have replaced spark plug wires, plugs and changed 3 coil packs 1,5,6. iv been dealing with a random misfire code p0300,p1380. i had gm hook up a code reader and they said cylinder 1,5,6 were the worst thats y i replaced the packs but to no avail that didnt help. i purchased a code reader for my laptop and started looking at the freeze frame data but to be honest im pretty lost with it. this data if from a trip to my cottage and back 100km/h for approx 400km

just wondering if any one can look at my data and give me an idea of what i should try next.

sorry the program i use wont let me save the data so i had to printscreen and piece it together

 

[Carder09]

[aflesch]

The throttle position numbers don't look right. It could just be the instant the freeze frame was taken but I would get a scope on the TPS just to make sure.

[Crunchnmunch]

The throttle position numbers don't look right. It could just be the instant the freeze frame was taken but I would get a scope on the TPS just to make sure.

 

 

I'll take off the plug and check what volts it's giving me

 

Any one else have any ideas or have ever incounterd those codes

[aflesch]

You can't just take off the plug and measure the voltage. You have to probe the sweeper on the POT from the back side of the plug with it still connected. Do the test with KOEO and run a slow smooth sweep from 0-100% throttle using the pedal to actuate it. You really can't do it with a DMM. You really need an oscilloscope or a scanner with graphing capabilities.

[Crunchnmunch]

You can't just take off the plug and measure the voltage. You have to probe the sweeper on the POT from the back side of the plug with it still connected. Do the test with KOEO and run a slow smooth sweep from 0-100% throttle using the pedal to actuate it. You really can't do it with a DMM. You really need an oscilloscope or a scanner with graphing capabilities.

 

 

ok ill ask my brother if his program can do that, he tunes cars for a living so im sure he can thanks in advance

[Crunchnmunch]

Any one else have any ideas on my misfires

[gmtech4]

did you go back and get your diagnosis money back after you changed the coils?

 

its THEIR fault it didnt work,

 

what was the labour for them to change the coils ?