YotaCurly

Ok to start with im really leaning towards the ECU being bad but heres the problem I reset the computer the other day to clear the codes and while doing so i pulled the EFI fuse. after doing this when my tranny 'Automatic' goes to shift into 2nd the engine dies but I can slam it down into low and the engine will catch again. After a while it will finally shift into 2nd but will hesitate and usually gets better as it warms up. Also when i go to stop, when the speedo hits 15 the engine will die , most of the time sometimes it catches and don't die sometimes it wont do it at all and run normal. Im pretty mechanically inclined but as to the situation im highly confused if anyone has any ideas just post them please.

Already tried, replaced AFM, tested TPS, tested O2 sensor-i think may be bad
reset computer several times any ideas i need major help!!!

YotaCurly

50 views someones gotta have an idea guys

scope103

What Sayeth the Good Book? http://www.ncttora.com/fsm/1990-1995...2/troubles.pdf

Your transmission will diagnose itself. Start there.

(and we're all impatient, but 3 hours may not be long enough to wait for a useful answer).

bone collector

i know you want help but why 2 different threads with exact same info?

EludeR

My truck runs like poo poo when its cold. This is due to a failed EGR valve. I am not sure if this relates to your issues though. Does the engine die when it shifts or is it something else ? BTW with how old our trucks are they are going to be notorious for vacuum leaks due to cracked vacuum hoses/lines. May be a good idea to go through those as well.

YotaCurly

Sorry bout so many post Guys thiis things my baby and just spent 1400$ on tires that i cant drive on it usually dies when shifting into second but after running it for a while it will finally shift but once in 2nd/3rd it will usually skip/stumble/choke for a momentary second
thank all of yall i hope to find the issue ive never seen anything like this

bone collector

Scopes link above will have most of your answers in it. After that fix the Knock Sensor like you said in the other thread

EludeR

Check your EGR system and vaccum. Sounds like you have at the least some serious vaccum leaks.

YotaCurly

how can i check the EGR system?

YotaCurly

transmission is spotless no problems at all i think when it dies the engine is flooded out because its hard to start and usually theres a strong odor of gas maybe o2 sensor bad ? but still no codes for anything at all has me stumped .... all leads back to the ecu..

bone collector

in the other thread you said it idled fine in park but it dies when shifting into 2nd. correct? did you check the tranny with scopes link? the o2 sensor does control the fuel mixture in your truck so if you think its bad and its over 60-80k miles then you should replace it anyway. vacuum leaks are always a possibility

YotaCurly

yea i may end up replacing anyway but i have to cut one off the nuts off of the exhaust without messing up the thread hopfully and then find new nuts .. any ideas as to where to get the nuts without goin to the dealer??