2G Noticeable Misfire Under Load

[Plymouthpr]

Hello all, I have a 1997 Eclipse GST stock 2.0 Turbo with an auto transmission. 115k miles. Lately it has been missing when you get on the gas or even when just trying to accelerate between 40-60 mph, but runs totally fine at idle or lower speeds.

We've recently put in new plugs and wires, fuel filter, and valve cover gasket. It's not throwing any trouble codes. We sent the computer in to see if that was at fault because my radio also started acting funny by not letting me put in my security code but all tests came back OK so I am thinking that's a different issue altogether.

Next step is to perform a boost leak test but wanted to get other ideas of what it may be from you guys. Let me know what you think!

 

[dwb]

Next step is to perform a boost leak test

Assuming the issue didn't begin after new plugs (properly gapped) and wires, I was going to suggest this.

If the BLT doesn't show any major leaks you might be dealing with a charging or battery issue. That might explain some of your electrical shenanigans too.

 

[chrysler kid]

The auto cars are really sensitive to throttle position sensor readings, make sure the tps has the retaining clip holding the connector to the throttle body

Second thing is to check fuel pressure. Misfires in boost can be cause by a bad fuel pump or the grommet that holds the fuel pump leaking pressure.