94 yukon keeps dying!

[Purpleslug]

my truck is being very weird. it started running rough had to give it gas at a stop to keep it running. i checked the CEL and it said EGR and oxgen senser. So we replaced the EGR valve and no luck, the EGR is opening fine from what i can see, also did plugs, cap, rotor, wires, idle control valve, pcv, o2 senser. i think thats about all i have done. But was just told this last saturday it could be the E10 there putting in the gas in oregon because alot of bikes, lawn mowers, Ect... are burning up because its making them run to lean. so i pulled my new plugs out to take a look and see what they are saying and wow lean as hell. so i drained out most off the gas so there is about 2 gallons left in it then put in some 110 octane that i put in the street bike to make up for the ****ty gas. Started it up ran rough for a min or to cleared up idled good till it got warm then idle dropped to about 400 rpms then starts cycling from about 200ish to 1000 rpms. then levels out for about 20 sec then starts over. so then i just tried to see if it will drive. when i put it in gear it just dies but if i can manage to keep it running in gear i can idle around but as soon as i put a load on the motor it dies or acts like its miss firing. let me know if you can help been trying to get it to run right since july and now weather is getting crappy and kinda need it running. thanks

 

[Purpleslug]

also changed the TB gasket

 

[718frankb]

do a fuel pressure check could be regulator or dirty filter- you should be some where around 55-60 psi

 

[Purpleslug]

o and the fuel filter is new also there is only one right? i will check the pressure tomorrow morning

 

[justin9844]

yeah like 718frankb said check pressure. i had the same problem with my 94 yukon but never figured it out sold it because it was nickle and diming me

 

[Purpleslug]

where the hell is the fuel pressure regulator?

Edit: found the regulator!

 

[NYrr496]

Is that thing a TBI system? Open up the top and make sure the injectors aren't full of crap.

 

[Purpleslug]

yeah its TB injected i have had it all abort there clean from what i have seen

 

[79powerwagon]

E10 is not the issue, just get that urban legend out of you head. Small engines, maybe, cars? Nope.

Did you reset your computer after installing the new sensors? Are your cats still working?

 

[Purpleslug]

well if reseting the computer is like a honda and just unplug the battery for more then 10 min yes i had the battery un done for a week. The owner before me did the new down pipe cat combo so its only maybe a little over a year old.

 

[Purpleslug]

does anyone have a vacuum line diagram or some way i can see if every line is there and in the right places