Test your EGR valve, check for vaccine leaks.
First hook up a manual fuel pressure gauge and position the face of the gauge where you can read it while driving. Your readings will direct you to the problem or problems. If your pressure drops, could be a bad regulator, fuel pump, or a fuel filter that is restricted. Also could have blockage in the fuel line or the fuel pump screen. Check the throttle position switch to see if it is working properly. Also do an upper throttle body cleaning including the TBAV. Throttle body air pass valve.
SOURCE: 0300 trouble code
check ignition system , sounds like a ignition miss fire p 0300 normaly is a coil or lead fault or bad spray patterns on the injectors can also cause a miss fire when the engine is cold .
SOURCE: toyota 22r runs rough
Find the EGR valve and underneath the valve there are holes, with the engine running try to open the valve by using a scredriver, the engine should die. do it a few times to clean the valve.
SOURCE: running rough, wont idle, bad gas smell
Possible injector failure. locate by disconnecting injectors one at a time. The one that makes no change is the questionable. Status of spark plugs need chkg also. pull the plugs an the one that looks washed is questionable good luck
SOURCE: Rough Idle/Runs Rough and low power
I would take it in and have them do a diagnostic on it, sounds like the cam shaft sensor to me.
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