missing under load

[jtsmith]

I have a 1996 Chevy truck 5.7 it runs fine but after it warms up driving it it is running fine until it start up a slight incline then it feels like it is missing or slipping but as soon as it is on flat road it is fine. I have replaced the fuel filter, pcv, plugs, air filter and the transmission filter. any ideas

[chuckster]

MIssing and slipping are two different things. Missing is a misfire and slipping is the tranny not holding.

These kind of things can be difficult to diagnose over the internet. Have you triedthe same incline cold and see what happens. It may sound wierd but how much gas is in the tank? You could have pick-up issues or the filter (sock) on the pump clogging. Can you be a little more specific as to what it does and I will be happy to try to help you.

[jtsmith]

it only does it going up a slight hill and it feels like is missing but if I give it more gas it stops. I just had some work done on it. I had a new intake manifold gasket repalced and the checked the head gasket. new oil pan gasket and transmission filter and gasket.

[chuckster]

I wonder if the intake gasket has failed. Start the truck and with the air cleaner assembly removed, spray carb cleaner along the seam where the intake attaches to the heads. then spray at the base of the throttle body (carb). If you have a vacum leak then the RPM's will go up. Almost sounds like that's what it is.