Why is my gas pedal so stff? How do I loosen it up?

I know this might seem silly but seen it a number of times in the shop, make sure nothing like double floor matts or newspaper is causing your stiff gas pedal. Open hood with engine off and manually play with accerlator and see if it binds. if you have one person in seat and another under hood that's under way of checking if its a mechanical or electrical issue

Hello there
How many miles does your Porsche have?
Is the pedal stiff or the operation of the shifting?
Does the pedal changes with temperature?Let me know...
proporsche

there's really no adjustment, if the pedal feels soft or it doesn't disengage you can try bleeding the fluid with fresh. If it still doesn't help it will likely need service

to bleed you'll need:
small hose that fits fairly snug on the bleeding nipple, around 8-12 inches in length.
small wrench (I want to say 8mm, but I can't recall for sure off hand)
a jar for the old fluid to be purged into
some DOT 3 (or higher) brake fluid

Preparation: place the hose onto the bleed nipple (just follow the hose from the reservoir, which is attached to the air filter box, down to the transmission itself, it should be pretty much up front and fairly easy to access) [my own preference is to use a closed end wrench on the nipple first then the hose to help hold it in place]

Bleeding: use the wrench to loosen the nipple a bit (maybe quarter turn), then press the clutch pedal, if the nipple is loosened enough it will easily go to the floor and stay there, go back around and tighten the nipple, then go back and pull the clutch pedal back off the floor, repeat the process until it appears that the fluid is clear, might be 20 or so repetitions. Don't forget to keep adding fluid to the reservoir as needed.

CHANGE THE THROTTLE CABLE,(from the accelerator pedal to the throttle body.)then see if sensor needs rplacement.

Stiff pedal on a Honda is always a cable problem unless you have an hydraulic clutch. No amount of adjustment will cure the problem. Replacement of the cable is the only option. In the event of an hydraulic clutch the problem may be a bit more serious as the only point where binding occurs is inside the bellhousing and the only way to get at it is removing the engine and/or gearbox.

Disconnect the cable from the pedal and see it goes down free, if so its not the pedal. probably the cable.

eather loosen it or replace it. It may be binding

worn out caliper maybe. is it on one side??? if so may be a bad brake line.

Good place to start, Make sure all cables & linkages at transmission are moving freely, especially kickdown. Spray with penetrating spray if appear stiff. With vehicle off & in park, have someone push gas pedal to floor & you watch linkages at transmission to see what they do, then when gas pedal released slowly, watch again where they return to & see if a little force (by hand) will move them in that direction a little further. If they do appear stiff or slightly seized, that's where you want to spray. then work it until it comes all the way back itself, then try it & see if it's any better.

your power brake booster needs replaced ,it work off engine vacuum and when the seal inside leak there is no power assist for the brakes