Have a 2002 Tribute (purchased new). Just bought gas, car idles rough...engine check light is lit (not blinking). Is this a definite sign of water in gas? Didn't use car for two days since snowstorm in our area. Never had a situation like this before...ever...so I'm not familiar with symptoms.

EGR Valve insufficent flow

Could be the valve or other system items

If it's running rough, chances are that it's misfiring. If the Check Engine light is flashing/blinking, it is definitely misfiring.
If that's the case, drive it as little as possible... Or straight to the mechanic because the more you drive it while it's misfiring, the higher the chance is of you ruining your catalytic converter.

I’m happy to help further over the phone at https://www.6ya.com/expert/jason_00b31cc8f593773a

it wont idle clean throd body with carb cleaner with car off open throd wide open clean good wipe out with a rag

Usually @ 50-60,000. New air filter, Gas filter, Plugs and wires.......If car starts running rough or hard to start and miss fire is a good sign of a tune up needed..............Hope this helps.

check for water damange getting or ciols or computer

check the fuel filter air filter and vacuume lines if they all good make sure the spark plugs are making a bright blue spark

Stop in at autozone or similar parts store & get free code scan, then see which way to go from there. Cheaper & faster than guessing.

1. will it stay running if you foot is sligtly on the gas.
if so common problem it the IAC valve located on top of the throttle body. it controls ait into the engine when throttle is closed.
2. do you hear loud fog horn like sound or hissing. this could indicate a vaccum leak.
3. are there any performance problems while driving.

my best guess would be the IAC (idle air control) valve

The po136 code is a bad 02 sensor, on cylinder bank #1
sensor #2, which is the downstream one. needs new one.

idle air control is jammed close little sensor on top of air intake gently tap it or clean throttle body with air intake cleaner hope it help fixya our post thanks pierre