2 L inline 4 2000 year. No fuel pressure unless you block the fuel return line. And a random misfire on at first piston 4 now on piston 1? the coil pack was replaced with new, new sparkplug wires, new temperature sensor, replaced the fuel pressure regulator. Problem persists... low to no power on acceleration can move car when rpms are slowly raized but only up to 3000 rpm. If you block the fuel return line can accelerate but the fuel pressure will remain at 80 psi, standing fuel pressure is at 38 psi; when vaccuum line to fuel pressure regulator removed the standing pressure goes to 48 psi.
No hair left on head because of scratching...

Occasionally won’t start until 3-4 try’s then have to rev it up

Check engine light is on when I come to red light the motor revs up and down I checked spark plugs they are all good. Some kind of vacuumed leak is happening. And seems to be oil leakage on bottom of engine

Replaced timing belt. Car started up no problem. Yeah. Well now it sounds like a moped going down the road. Loud noise like hole in muffler when shifting into 1,2 and 3. Once into 5 all is fine. No hesitation no idling rough. No pressure loss. Could damage have been done while being towed to exhaust?