Stumbles when given gas
#1
Junior Member
Thread Starter
iTrader: (2)
Join Date: Oct 2008
Location: VA
Posts: 26
Likes: 0
Received 0 Likes
on
0 Posts
Car: 87 IROC
Engine: 383
Transmission: T5
Axle/Gears: no idea
Stumbles when given gas
its a 383 stroker from blueprint motors. originally, it had an edlebrock carb, but they gave me a holley after the edelbrocks were giving customers problems.
now, when given gas off idle, itll stumble for a second, then rev up like normal. happens in neutral and when driving. ive had people suggest timing, fuel level in the carb, and even needing a walbro 255.
it has the stock fuel pump (it was originally a 305 TPI), to a pressure regulator set around 3-4psi.
the timing is set properly, as best as i could do it. im not sure of the holley model. i did unscrew the big brass screw on the front of the carb, and fuel came out, so i dont think its starving for fuel off idle.
im not very experienced in carbs, at least not in tuning them. any ideas?
now, when given gas off idle, itll stumble for a second, then rev up like normal. happens in neutral and when driving. ive had people suggest timing, fuel level in the carb, and even needing a walbro 255.
it has the stock fuel pump (it was originally a 305 TPI), to a pressure regulator set around 3-4psi.
the timing is set properly, as best as i could do it. im not sure of the holley model. i did unscrew the big brass screw on the front of the carb, and fuel came out, so i dont think its starving for fuel off idle.
im not very experienced in carbs, at least not in tuning them. any ideas?
#2
Re: Stumbles when given gas
Try going through the tuning post. Start by checking the fuel level and the basics. Sounds like you could use a hair more PSI, around 7 is normal but I doubt that will solve the problem. Im guessing you need to adjust the accelerator pump linkage and or cam and or squirters. Have a look at sofa's tuning sticky here:
https://www.thirdgen.org/forums/carb...ey-tuning.html
https://www.thirdgen.org/forums/carb...ey-tuning.html
Thread
Thread Starter
Forum
Replies
Last Post
Bobby_80s
Transmissions and Drivetrain
6
04-26-2007 01:00 PM
crazeinc
Tech / General Engine
4
11-23-2000 10:53 PM