Idle to Throttle

[RDBTruckshows]

I have a '90 K1500 with a 350 engine. Just installed a Edelbrock #3704 intake. I don't have a timing light but moved the distributor a hair and got an idle with no misses, stalling, or reving. However, when you try to accelarate, the engine tries to die and once you let off, it goes back to idle just fine. I had a Power Aid throttle spacer on the stock intake and put it on the Edelbrock...that shouldn't make any difference...correct?
Any Ideas. Next step, get it on a trailer to a shop with diagnostics.

[Lukn4trbl355]

i did the same intake swap, did you make sure you didnt switch up the firing order on the distributor??? i did on accident, didnt sound as healthy as it did and had no balls but still idled fine. id set the timing(if ya dont have a light) by where the truck idles the smoothest, and do it when shes at full operating temperature. and if that dont help check to see if your firing order is out of sequence. like i said i did it, it aint a big deal man **** happens. as for the spacer i highly doubt that wouldve affected it. if you had a scanner see if theres missfire on two cylinders, if so your wires are criss crossed. check the white sheet with instrcutions edelbrock gave you and look at the firing order on the drawn distributor

gud luck n let us know how it worked out

[RDBTruckshows]

Thanks, but after checking again, the wires are correct. As soon as you give it any throttle, it just dies like it is starving for fuel. It is getting fuel.
Any other ideas?????

[Lukn4trbl355]

Idle air control, its on the pass side rear of the throttle body. have you checked your fuel filter? if the truck didnt do this before the intake mani swap its most likely ignition related. but if its dieing my bet would be on the idle air control. it has to be adjusted. also check your cap and rotor to see if theres any moisture in the cap, had water get into mine and had the same symptoms. but i really think its the idle air control, my friend had the same problem last week and it was the IAC, so try that and if it dont work lemme know, and if i think of anything else i will let you know asap!!

[RDBTruckshows]

I really appreciate the advice and maybe I didn't understand your comment on the iac. The truck idles fine and will idle as long as you have it running. My problem is when you start to accelerate, it will not come up to speed and dies, unless you let it go back to idle...and then it just keeps idleing.
THANKS!!!!!

[Lukn4trbl355]

no problem man but damn thats weird. so is it just when the motor is under a load??? if so its most likely ur fuel pump. hopefully some of the other guys will chime in cuz im running out of ideas of what could be wrong. but whats happening with ur truck is pretty weird. sounds like a nice truck dude, n 90s a good year haha, i got one 2

[NEUMANNZZ]

check fuel pressure(9-13psi) 10-12psi engine running. use a t connection fuel pressure guage in place of fuel filter.


check timing with a timing light bypass wire disconnected(tan/black wire) should be zero degrees on a small block.

report back with results.