Rough idle

[Bmartin]

I have a 93 chevy Silverado 5.7 engine 4l60e trans and a k1500 it has started to idle up and down when I start it in the morning then when it warms up it stops does anyone know what would cause it and what to test

[61_FL_Apache]

Idle Air Control Valve is probably going bad. Easy fix.

[Ronald29609]

1967 Chevy Pickup. Gen1 350, Edelbrock, 200-R4, Rough Idle problem. My 350 ran great for months. At idle the engine was so smooth that it didn't move at all. I had to make a hard stop almost locking up the brakes. After that it idled so rough that I thought the engine was going to rattle the truck apart. Once I accelerated it went away. I drove about 50 miles and it cleared up some but still not as good as before. Any ideas will be appreciated.

[Deer_hunter_088]

Originally Posted by Ronald29609

1967 Chevy Pickup. Gen1 350, Edelbrock, 200-R4, Rough Idle problem. My 350 ran great for months. At idle the engine was so smooth that it didn't move at all. I had to make a hard stop almost locking up the brakes. After that it idled so rough that I thought the engine was going to rattle the truck apart. Once I accelerated it went away. I drove about 50 miles and it cleared up some but still not as good as before. Any ideas will be appreciated.

sounds like you knocked some trash into the carb, or if its fi, then the injectors need cleaned. get the carb rebuil, or new injectors and it should clean it up.