Problem with take off

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Sep 30, 2024 | 12:44 PM

Ty Roc 420

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Joined: Sep 2024

Posts: 2

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From: Bakersfield

Car: 1990 IROC Z

Engine: 350 tpi

Transmission: 5 speed manual

Axle/Gears: Stock

Problem with take off

I have a 1990 IROC that came with the 305 and manual transmission. I put a 350 in it about 7 years ago. It ran great. It sat for a few years but still ran good until now. On the freeway or even in town it runs fine. It's when I go to let the clutch out on take off it just won't go. The more gas you give it the harder it stalls. If I'm real easy on the gas it will go and once I'm going it's fine. Only when I take off from a light or any time I stop it just doesn't want to go. It throws me forward in the seat. If I I'm out of gear and I hit the throttle it has a little hesitation. Also some days it idles fine the next day it might idle really high. Then another day it idles so low it won't stay running. I've replaced the fuel pump( not a fun job) I've checked all the sensors. The only thing I'm thinking is maybe the fuel regulator. Any suggestion would by most appreciated. Also when I give it full throttle it acts like it has a power band. I know it doesn't so whatever is causing this problem goes away sometimes when I'm flooring the pedal.

Sep 30, 2024 | 08:35 PM

aliceempire

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Joined: Nov 2008

Posts: 2,093

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From: Milwaukee

Car: 92 Firebird, 77 Trans Am SE, 86 Z28

Engine: 5.7 HSR, T/A 6.6, empty

Transmission: T-5, TH350, T-5

Axle/Gears: 3.08 posi, 3.23 posi, 3.23

Re: Problem with take off

Test your fuel pressure with a gauge when it's acting up. Check for bad vacuum lines for grins. I wouldn't rule out injectors either. If they're multec injectors they're problematic anyway.

Sep 30, 2024 | 10:06 PM