Hi everyone, I have a 2003 Hummer H2, when I get one the Highway and drive 60 mph my check engine light comes on and starts Blinking I thing its 33 times and then shuts off I got the code checked and they told me it miss firing I would need a tune-up I did but it did not fix the problem, it does the something, anyone know what it might be?

 

When you go 60mph on highway what do you feel? Any vibration? loss of power? Also where did you get it checked up?

 

Thank god it only blinked 33 times. If it ever makes it past 35 blinks I would strongly advise pulling over and shutting it off immediately.

(I'm joking.)

 

What was the codes?