Do you have a fuel gauge, may be your fuel pump going bad. If you have or can get a gauge try to see what psi you have when accelerating.

 

ok ill check when i get my hands on a guage but would a bad fuel pump work decently in reverse cause when im reversing i have no problems only my forward gears

 

Am still wondering why torkum isn't pressing the engine code thing, I'm still learning this newer stuff myself, stay with him, his advice is always sound.

 

You've got a transmission problem, that's why their is no CEL.

 

He kept saying no light and sometimes the misfire detection is a little slow to respond.

 

i just bought a diagnostic tool and i got

P1401 DPFE Sensor Circuit High Input
P1409 EGR Vacuum Regulator Solenoid Circuit Malfunction

DTC for which Freeze Frame was Stored P1409
Fuel System 1 Status Closed Loop
Fuel System 2 Status Not Supported
Calculated LOAD Value 28.24 %
Engine Coolant Temp 158.00 °F
Short Term Fuel Trim - Bank 1 -8.59 %
Long Term Fuel Trim - Bank 1 -2.34 %
Short Term Fuel Trim - Bank 2 -12.50 %
Long Term Fuel Trim - Bank 2 -3.13 %
Engine RPM 775.50 rpm
Vehicle Speed Sensor

 

how about plugged converters...we see them come in customer complains that there is now accel, when pushing the gas to the floor the vehicle stumble/sags/fall on it's face. if you access to an exhaust pressure gauge, check the converters.

 

Hello all, great resource you have here!

Gentlemen, can we keep this thread going and keep throwing out answers here:

I was driving fine until the EXACT same condition as Runtzz suddenly occurred with my 1995 F150, 5.0l, auto. Ok, some of the engine mechanisms have changed since Runtzz 1997 engine, but the same problem persists:

No load: engine runs ok / only Intermittently stumbles & shakes
Under load: Engine stumbles almost to stalling, must feather the throttle to keep a steady 5km/h..

-Strong smell of fuel, so we know the fuel pumps are ok - changed fuel filter anyway,
-Changed cap & rotor, plugs were fouled but no improvement with replacement,
-Re-checked my plug wires to assure correct firing order...
-Going to pull the throttle body off next & clean / test the IAC solenoid...

The EEC -IV gave me 3 interesting codes:

172 HO2S system indicated LEAN condition (our biggest clue) - continuos
334 EGR valve pos. sensor out of expected voltage range (high) - off, running
538 ??! What the heck does THIS mean? - off, continuous

The condition occurs intermittently (AFTER I think it's ok to take a drive,) but is at the point now that it's not at all drivable.

PLEASE HELP!
Thank you!