K10 Misfiring

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Fleetwood

Member
Joined
Dec 15, 2021
Posts
41
Reaction score
5
Location
Kansas
First Name
I
Truck Year
1987
Truck Model
K10
Engine Size
350
I have an 87 k10 that has started misfiring recently. When I first turn it on and I am driving it around it runs fine. Once it warms up it starts to misfire at throttle under load. When it's in neutral it doesn't do it. It is especially bad when I am going up hills and it gets worse as the truck gets warmer. It sounds like it is hitting a rev limiter. What could be the problem?
 

Bextreme04

Full Access Member
Joined
May 13, 2019
Posts
4,170
Reaction score
5,063
Location
Oregon
First Name
Eric
Truck Year
1980
Truck Model
K25
Engine Size
350-4bbl
When was the last time you did a tuneup? Worn cap/rotor/wires and worn or dirty plugs could all cause that. Make sure plug wires aren't shorting out on the manifolds too.
 

MrHorsepowerLSx

Full Access Member
Joined
Jun 25, 2021
Posts
277
Reaction score
585
Location
New Jersey
First Name
Jeffrey
Truck Year
1979
Truck Model
K35
Engine Size
454
When you mentioned " sounds like a rev limiter" are you saying the transmission is slipping or that the misfire is so bad that it is not firing and the motor is pinging? Are you still on the factory TBI or converted to a carb?
 

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