tedhamm63

98 chevy 1500 pu 5.7 Z71 loses power when it warms up I put new coils new ignition module new plugs new wires and new o2 sensors no change, runs great when you first start it, when it warms up it idles but when you give it gas it has no power,bogs down at 2000 rpms ,

new2me

Sound like fuel related problems,When was the last fuel filter change?Fuel pumps in these years have also been an issue.Hows the cap and rotor?

JKR1040

It maybe the air mass sensor, I had that problem once, it would idle fine until I got on the gas around 2000rps then it would either lose power or die on me.

tedhamm63

thanks New2Me you were right on the money this is the third fuel pump i have put in this truck now it runs great till next time thanks to everyone for the replies