Join Date: Oct 2014
Location: Nashville, Tennessee
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Ryan, good advice from svedesvede to check trans as when you put the car in park it takes the load, the trans off. A trans via the torque converter adds a little drag or load. But a car can misfire only under load.....and not necessarily be the trans
These modern cars are very susceptible to low fuel pressure problems, like it should be 60 PSI and it is 52PSI and you start to see hiccups or drive ability issues.
Also modern cars all have a misfire monitor, avalible thru a scan tool. Any garage will have one that can log in from a connection under the dash and read the misfire monitor. That helps isolate it if it is on one cylinder or a broader problem. Like low fuel pressure, that has to be checked with a fuel pressure gauge.
Easy things to check is ensure all plug wires are clean and tight, take out spark plugs if you can and check the condition gap etc. when the car is running you can put your finger on the fuel injector and feel it working, if one is not vibrating You have a place to start, bad FI, bad wiring, bad computer drivers of injector.
Have you ever changed the fuel filter?
But likely you will need a scanner and a fuel pressure gauge. After as svede said, check tranny fluid first, is it low? Real dirty? Make sure it is right.
Low fuel pressure feels like a lot of weird stuff. But maybe you know that you have a new fuel pump and clean filter...