So I take this speed bump, try to accelerate afterwards and nothing, gas pedal is unresponsive. RPM is completely stiff on 1.5k, I pull over put it in neutral, try to step on the gas and nothing, it idles usually bellow 1k now its unmoving at 1.5k.
I turn the car off and turn it on again, same problem, I turn it off and pull the key out then put it back and turn it on again and its fixed.

Feels like an ECU/ electrical problem, any help appreciated.

 

start with the simple stuff; check your battery terminal connections and battery charge/level. yes it does sound like an electrical issue, and the bump caused a connection to come loose.

 

check the connector and plugs/wires going to your throttle body, if that knocked something loose, it would likely be there since that's what controls throttle position. 98+ had a hybrid drive by wire and cable operated setup. Try also cleaning the contacts for that TPS sensor going to the throttle body in case you're getting any codes, not sure if you are or not since it wasn't mentioned. Also you can add dielectric grease to the contacts if they show any signs of corrosion.

 

Although the symptom was gone, your ECU must be holding the error code. Read the code first. It probably be P112X which means that the throttle control related.

I think I can fix it simply replacing the exact part reading the code.

 

Today I got the problem right in my garage with no speed bumps or nothing, throttle was completely dead, disconnecting the battery then connecting it again fixes it. Weird.

 

You will have the problem again soon. You'd better to read the error code ASAP and determine what part is failed and causing the problem. I bet your APPS or the TPS has a problem of unwanted resistance changes. The error code will tell what to do next.

 

if it does happen again you can still press the pedal all the way down which will manually move the throttle plate ever so slightly

my car will on rare occasion do this too... it usually just starts as the idle suddenly becoming like 1500, and i've noticed that if i catch it early and shut the car off somewhere for like 10 min it's usually good again right after that for awhile

there was maybe 1 or 2 times when everything did go unresponsive like you're getting here with an accompanying CEL, i got back P1121 which is accelerator pedal position sensor (APPS)

also make sure your throttle cable itself has just a slight amount of slack, if the cable is too taut it can cause that APPS to act up

 

Pressing the pedal all the way down can barely rev it up slightly and it sounds kinda rough.

I tried to manually rotate the throttle cable thingy and it doesn't rev there.

 

unhook the negative battery terminal for like 15 min so all the electrics can reset

and if you don't already absolutely get one of these little

 

FYI to the forum runners, Amazon links which are posted on this forum are automatically reformatted to include incredibly toxic redirection code. These links work within Edge & Firefox, but are blocked by chrome.

It automatically converts these Amazon links into affiliate links so the forum owners can scrape some money - which is fine I guess, I understand why it's done. It just sucks when this breaks functionality on some web browsers.

 

oh yea look at that... well it was a link to one of these lol