I suddenly have a low idle in my 2005 tacoma at stop signs. The alternator was JUST replaced today and this happend when driving the truck home. It has been at the repair place for a month for other issues (body work) and I'm wondering if it could be the fact that it has sat so long with a half tank of gas and not ran. Would a fuel injector cleaner help at all?

SOURCE: Strong fuel smell

Hi,you should check fuel presure regulator......

SOURCE: 1999 toyota tacoma Sr5 won't start

Check for fuel pressure when starting. Fuel pumps have a check valve in them that keep fuel in the rail at the injectors. If the check valve fails, the pump has to pump fuel all of the way up to the engine. Same thing with hot no-restarts. Fuel pump.

SOURCE: 99 tacoma

Still need the codes.
Injectors can go "bad" in a couple of different ways; all they are is an electromagneticaly controlled nozzle. When the ECU "fires" the injector, it pulses a ground circuit for 4-8 milliseconds, the electromagnet powers up, the valve at the bottom of the injector opens, and the fuel shoots out, under pressure. The wire can be bad/chafed/corodded/ The electromagnet may be weak. The nozzle may be stuck. Lots of things. But, to put in an injector for a number 4 cylinder misfire (p-0304 code) would be one of the last things that I would do.

SOURCE: 2005 toyota corolla light comes on then goes off for a few days e

i had the same codes and the same "bucking" on my 05 Corrolla. I had my mechanic replace the solenoid (not cheap) and the light stayed on & the codes were the same. He thought my computer needed to be reflashed after the fix. I took it to Toyota where they ended up switching out the computer...free of charge.

Apparently 05 Corrollas have a "bulletin" on the faulty computers. they cause the check engine lights to light up & give those readings. It is not a recall because it is not a safety issue.