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I have an 08 TB LT with code p0300 I have changed spark plugs, clean throttle body put like 2 cans of injector cleaner check injectors check for vacuum leaks I also put 3 can of the valve cleaner check the timing the truck runs good on highway but when I stop at a lite or idle it start shaking not like if it want to turn off but just a rough idle what am I forgetting to check?? Pls help it only have 85000 Miles on it need help pls and thank u
 

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2004 gmc envoy_slt_xl
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Could be a motor mount also. When they get smashed it can cause all kinds of weird things to happen
 

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2004 chevy trailblazer_lt
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The P0300 code is a random misfire code while all the other misfire codes (P0301 - P0306 )denote a misfire problem in a specific cylinder.
A Random P0300 Misfire code often indicates a vacuum leak or bad gas.
Check for a bad vacuum line leaking ( upsetting the fuel mixture ) or a bad batch of (water / contamination in it ?) fuel....
 
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