code p0300

2001 tundra V8...
at idle started running rough, gets worse when driving.
codes p030, p0305, p0307.
since 3 cyl. are failing don't suspect plugs or coils.
Possible timing belt??? any thoughts.

 

Have you done the belt ? Belt stretch usually affects all sides of engine . Not just one bank . Have you checked sparks plugs ? Sparks plug wires ? If you have access to a scanner you can do what’s called an injector balance test . Have you checked the MAF ? It’s hard to diagnose through a keyboard

 

This replacement belt has 73,000.
I think MAF would affect all cylinders,
injection issues would give different error codes.
Driver's side is giving p0300 codes, that's why I'm suspecting belt jumped a tooth on driver side cam gear... but still a guess.

 

Injectors that are clogged will give the same error code . P0300 is a general misfire . How many years on that belt ?