Bogging Down
 

Ok i have been living with this problem for a year. here it goes...... My truck idles fine runs fine but when i come to a stop sign or if i am in a parking lot in a low gear it bogs down like its going to stall but it never does. like i said it idles fine let me go over a list of things i have done on it, fuel injectors, map sensor, idle control valve, resurfaved heads valve grind new rockers, fuel pressure regulator, egr valve, egr valve solenoid, catlyst converter. Also i ran a compression check on it its goes from 135 to 140 which is good!! I have good oil pressure i am just lost here and i want to figure it out!! Any help will be appreciated.

OH F.Y.I its a 1995 chevy k1500 (4x4) 5.7 litre 350, manual transmission,

please can anybody help me with this problem?

Does it do the bucking manuever?

how are the brakes? When my brake booster went out, there was a vacuum leak that made it seem like that also. But if the pedal isn't starting to get hard then fall to the floor then I doubt that's your problem, especially since it's done that for a year. Might be a vacuum leak somewhere else though.

No its not the brakes ive already replaced the booster that was another one of my thoughts. And yes it kind of bucks why what could that be? Thanks guys for your help!!

Can anybody help me???