I'm not sure what to search for, so if it's something simple, I do apologize.

My problem is that my engine has recently (within the last week or so) started to....sputter, I guess? When I put some gas on hard, or even normally sometimes, it has a problem getting going, and it's not a smooth acceleration.

2nd problem is, it doesn't happen all the time. In fact, it only seems to happen after the car is run for a bit. If it's a cold start, almost no problem (as far as I can tell). So diagnosing it is being troublesome, because when someone has the time to look at it will probably be when it's been sitting around a while.

It's not the transmission, because I sat in my driveway and had it idle in neutral, and had the same issue. There is no check engine light on, and the oil was changed about 22 days ago at a dealership.

Any information would be super helpful.

 

Fuel Pump?

 

Cam position sensor?

 

throttle body

 

Really think it's the throttle body? I have a plenum spacer installed, and I had to reset it when I had it put in. Do you think resetting it again will have it fixed?

 

If the problem is not activating a CEL, it could be as simple as a slightly clogged fuel filter/line or a problem with your plenum spacer. I'd still recommend doing a scan and checking for any codes that might be in storage. Whatever the case, don't let the problem linger and get worse.

 

Already in the shop to see if they can find something! No way I'm gonna let my poor Z be like this and still drive it around.

Gotta respect the ride to make it last a while lol

 

Just an update, in case anyone wanted a follow up:

Mechanic couldn't find anything wrong, but then again, based on my experience with the problem, it won't happen until the car is ran for quite some time. I'll come back to the thread if it happens to pop up.

 

misfire counter on mode 6 data came up inconclusive? if it happens when running hot go towards ignition, coil breaking down or shorting... plugs are healthy?