Trying to help a fellow Tacoma owner is distress. His 99 3.4L 5spd manual completely bog's and almost and sometimes does stall when any throttle is applied. The truck is unable to drive at all. Any help/suggestions to try would be greatly appreciated! The check engine light has not been triggered either which I find odd for the truck running so poorly.
New Fuel pump installed
Checked spark plugs
Checked PCV for vacuum
disconnected catalytic conv to rule out being clogged
checked for various vacuum leaks