i am at a loss, my 3vze 3.0 v6 94 is missfireing, at idle its fine but when i drive it i hear a missfire through the intake i have checked the timming about 20 times an have ajusted it to see if it changes anything but is still the same. new heads, cams, valves compression is good 150ish except for #3 at 120 added oil to #3 went up to 130 psi. i have a cold air intake, doug throlly headders high flow cat flowmaster exhaust, replaced the plugs and wires NGK, new cap an rotor, i need some opinions im thinking the injectors may need to be replaced

 

one cylinder at 30 psi less; sounds like you discovered your miss....

What the heck is a missfire through the intake???

 

Back fire through intake? That slight drop in compression is more than likely the intake valve on that cylinder staying slightly open on power and exhaust stoke causing a back fire through the intake....

Assuming thats whats happening...

You said its got new heads and cams... i would check valve clearnaces, esp. on your compression drop cylinder #3.

 

ok ill check it im super busy so dont have much time to work on the truck but will do, valves are new too.. also my timing belt from auto zone seems a half a tooth off!