Hey guys I've got a 98 Tahoe 2dr 4x4 5.7 that's been giving me problems for some time. Here's a list of the stuff I've done or had done.
Plugs,wires, ac delco cap and rotor, fuel pump, filter, new spider system all ac delco., intake gaskets, complete new dist. , crank shaft sensor, map sensor. When the intake gasket was done it solved the problem for a little while then it started again, I took it to a friend and he put his scan tool on it and told me the map sensor was bad, so I replaced it and it ran better than it every has. Well 3 weeks later I'm right back where I started still showing random misfires. Something I forgot to mention this only happens under load pulling my lawn trailer . I took it back to my friend with the trailer so I could get it to miss which it did. After driving and getting it to mess up the guy told me he's never seen anything like this. He said cyc 4 starts first followed by 6, 2 then 7 , 3 , 5 starts on the other side. He showed me the scanner and 4 and 7 are the main ones. I know there's stuff I haven't mentioned so fill free to ask.
Thanks