i got this 1998 GC2 running on ej15.almost everything is stock but now i have a very serious misfire. tried troubleshooting the coil pack and the plugs, same as the plugs, but when the car heats up, its a mess. i cannot even go uphill because the car just stalls. i even changed the clutch but still the same issue.

i also get some funny behaviour when on the freeway, when i foot the pedal, it will take a few moments to pick up and sometimes evens jacks making a very rough ride.
please help me troubleshoot

Sorry, a 1.5 litre EJ? Power?? 

Sorry, couldn’t help myself. 

On a serious note, have you checked for codes from the ecu (if it has one)? 

Or looked into the coolant temp sensor? 

If it’s running a dizzy, is there an issue in there? 

Cheers 

Bennie