78 Square
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- First Name
- Justin
- Truck Year
- 1978
- Truck Model
- K10
- Engine Size
- 350
No power up hill or after 45 MPH
- Thread starter 78 Square
- Start date
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78 Square
Full Access Member
- Joined
- Jun 4, 2015
- Posts
- 56
- Reaction score
- 1
- Location
- Pennsylvania
- First Name
- Justin
- Truck Year
- 1978
- Truck Model
- K10
- Engine Size
- 350
Sorry guys, I'm not sure why they're all sideways.
chengny
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- Location
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- Jerry
- Truck Year
- 1986
- Truck Model
- K3500
- Engine Size
- 350/5.7
Indexed correctly and twice as big:
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Last edited:
MadOgre
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Thanks Jerry
I would say for starters get a couple cans of carb cleaner and spray all the linkages down real good while trying to move the throttle back and forth.
I would also check and make sure that the Secondary Throttle -Blade Lockout tab is allowing the secondaries to open. You need to check with the engine fully warmed. Its a little tab on the passenger side that locks the rear secondary throttle shaft from rotating until the engine is warm.
I circled it in red
I would say for starters get a couple cans of carb cleaner and spray all the linkages down real good while trying to move the throttle back and forth.
I would also check and make sure that the Secondary Throttle -Blade Lockout tab is allowing the secondaries to open. You need to check with the engine fully warmed. Its a little tab on the passenger side that locks the rear secondary throttle shaft from rotating until the engine is warm.
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I circled it in red
Last edited:
grandpa's75
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- Sep 25, 2015
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- Location
- Montana
- First Name
- Todd
- Truck Year
- 1975
- Truck Model
- K20
- Engine Size
- 292
I just came into a 75 K20 with a 292 i6, 4 speed manual. Went to bring it home and had the same issue. Starts fine, idles fine. 1st, 2nd, gear no problems. Getting up to speed in 3rd and more so in 4th, it's like she chokes out and starts sputtering. I was thinking carb issue. It has a Rochester mono jet. Anyone have thoughts there?
grandpa's75
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- 1975
- Truck Model
- K20
- Engine Size
- 292
I don't mean to take away from what you got going 78 square. Similar issue, hoping to get some help too.
grandpa's75
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- Truck Year
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- Truck Model
- K20
- Engine Size
- 292
I can pop it out of gear, rev the engine and it comes out of it. Back in gear and right back to sputtering.
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