Check engine light blinking and traction control

You have a misfire. Have code read

It has a p0300 code any idea what I need to do to fix it

Here's a video that talks about P0300 code..could be se veral things...spark plugs at 2 or more are bad...fuel filter or pump(low fuel pressure can cause random misfire)...chk the battery if its weak it can cause it too. Also could be a broken vacuum line...or leak around exhaust manifold.

I’m having a very similar issue, have you gotten your resolved?

After replacing all lifters, four valves, and Vlom and it still messing up after driving for 15-20 minutes. I realized it maybe didn’t have enough oil pressure to execute cylinder deactivation so I took it to a shop and had him unlock the ecu and delete the afm feature. Now it drives great. The bullshit of it is that a gm store will tell you need a new motor And so will GM enigneers even though they know they could just delete but they won’t. The gen4 5.3 motor was designed to do cylinder activation by using oil pressure, which it robs from the motor. The gen3s didn’t do this and they can rub 3-400k miles the gen4 motors will only run 120-150k miles before the oil pump is worn down enough to where it can’t provide enough pressure to execute cylinder deactivation. I’m not a tech and I’m just going off what my guy is telling me. I’m hoping this helps y’all.

GM has a recall on the Throttle Positioning sensor Makes it run like crap with loss of power. Might want to look into that. My code was P2135 2009 Chevy Avalanche 5.3 flex fuel eng..

I think sensors all start failing after 10 yrs and I'll be trading mine in. Loved it for 10 yrs but $3K in repairs last year and now tire sensor and ECU both need service? What next? How many post-its do you have to use to cover alarms, LOL. I'm done. Will miss it a lot. Also leaks in rain/snow into both driver and passenger sides now so complementary steam up when sun comes out. . .

BTW, this is a 2008 Chvy HHR, sorry I didn't clarify before.

I have a 2008 HHR LT. Chevrolet & the problem that iam having is that the engine light will come out & say engine reduce power so the car starts to slow down to a point is stops so many attempts to start it up but stops again it start & works when it wants to....help?

I have Chavez he I fix everything but I still have check engine light says miss fire I don’t know what it is I spend more than the car price to make the car run but every time I got unhappy about the Chavez car not good option to buy it is has problems and craziness