Hard acceleration sputter....

[DAGEN]

I have a 97 chevy with the vortec l31 350. The truck runs great driving around town cruising etc, however when i mat it to WOT around 3200 rpm it has a very noticiable stumble then carries on thrue the RPM range. Anyone else have this happen? Not throwing any code's and i always keep the tune/ maintenince up to spec. Btw other than Intake, exhaust, and 180 thermostate it's pretty much stock for the engine.

 

[monstar_est87]

Im having this same problem, I have been for a while now... I suspect its the fuel spider assembly in mine.... It really stumbles when u floor it... I changed my fuel filter, my fuel pump is running at the correct pressure... I cleaned my K&N CAI and MAF and the throttle body and im still stumbling when the beast is wide opend... Thats really all I can think of..? Spiders clogged up from over the years and need to be replaced...

 

[JonZ71]

MY truck was kinda doing the same thing. Would do it worse when loaded with a trailer. The other day i was towing a horse 350 miles, i got about 200 miles away from home. It started bucking the whole truck at 70 mph. i could barely get out of the way of cars. Found a autozone about 3 miles away and limped it there. Threw a cap and rotor on it... Boom fired right up.. Black smoked like a diesel for all of 10 seconds too haha

 

[DAGEN]

I just did a full tuneup on it though. When it does it say im accelerating hard thrue 2nd gear and around 3200 rpm it stumples for just a second then continues thrue the rpm range. I did have the same problem as you before with cap and rotor though before the tune up.

 

[DAGEN]

Exact same thing im having go on by the sound's of it. Monstar, i may end up swapping mine out for this http://www.gmpartsdirect.com/results.cfm?singlepart=1&partnumber=PK93441235
If no one has anymore ideas or anything ill go this route unless i don't rebuild this motor and go to a ******'s or lq9 setup. I was kinda leaning toward what u also think the problem is.

 

[JonZ71]

Could be torque management too

 

[DAGEN]

I never really considered that. I am still in need of a Black Bear tune.

 

[jeff's88silverado]

Exact same thing im having go on by the sound's of it. Monstar, i may end up swapping mine out for this http://www.gmpartsdirect.com/results.cfm?singlepart=1&partnumber=PK93441235
If no one has anymore ideas or anything ill go this route unless i don't rebuild this motor and go to a ******'s or lq9 setup. I was kinda leaning toward what u also think the problem is.

Search for that on amazon you an get it around $200 and its delphi

 

[DAGEN]

^ alright thanks for the head's up.

 

[monstar_est87]

Yea i did the full tune up to... Then my problems started down the road... Yea thats the one
(spider assembly) for the for the parts that need 2 last, I only trust Delphi or AC Delco...

Fuel injector: http://www.amazon.com/gp/aw/d/B000C2GE6K/ref=redir_mdp_mobile
Gaskets: http://www.amazon.com/gp/aw/d/B000TYLIFS/ref=redir_mdp_mobile

If ur going for a tune as another option check out the 411 swap... Talk to Aloicious or Lextec and they could set u up...