I need help

[zapata22]

ok where to start I have a 87 gmc with a 350 and when i am driving it seems to lose power them I give it more gas and it gets smooth then it does it again and this is at all speeds I changed the plugs, wires, cap, roter, modguel, coil, m.a.p.,fuel pump and filter checked for vacume leaks and still no change o and checked timing. plz. help I miss my truck.

[Jonboy]

check the wires going to the injectors. I had a suburban doing the same thing, and one of the electrical connections at the injector had broken, and would contact intermittently.