Sticking gas pedal on 1999 buick LeSABRE

40psi isn't good enough.

Buick lesabre limited: what should fuel pressure be on a 1992

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Jul 23, 2012 - The fuel pressure should be 41-47 psi. Fuel pressure should actually increase when the accelerator pedal is depressed. If fuel pressure reduces ...
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Have you tried testing anything right after it dies? Find out what's missing - spark, fuel pressure etc. Could be ignition module, crank sensor, etc. You need to find out what is missing then diagnose the system that failed.

time for a tuneup COMPLETE

The throttle body is likely a little worn and causing the throttle plate to become jambed in the bore.Adjusting the minimum air rate up a bit will cure the symptom

check fuel pressure should be 41-47 with key on engine off.Sounds like weak pump.

if u tried starter fluid and it didnt at least hit or run for a sec or so then its not firing

this is usually the sign of crank postition sensor failure. If you can keep the engine going using the gas pedal then this is probably not your problem. if you can hold down the gas pedal a little and the engine runs, then clean or replace your idle air control valve _ or IAC.

I had same problem on my 2004 lesabre, I waited until it was stuck and opened the hood and pulled on the throttle by hand very easily and could feel it sticking there, so I sprayed carb cleaner on the springs and around and through them. This loosened it up right away and have not had any trouble since, I did not spray anything into the throttle body, Good luck

what happens when it does finally run, does it run rough, black smoke?? if the fuel pressure regulator is leaking it COULD causet his problem. Find the regulator and take the vac hose off, if there is fuel in the hose, replace the fuel pressure regulator.

Check front engine mounts. Open hood, hold brake pedal down, put car in drive, press gas pedal down a little and see if engine jumps up due to a broken mount.