Hi, i have an ea falcon 3.9 manual MPI, the problem i seem to have is that at light cruise speeds, around 50-60km's/hour it seems most noticable there seems to be a subtle surge in the engine. it isn't enough to really rock the car or anything but you can just feel it. I'd say it feels like a subtle lean surge but i can't figure out why. Fuel pressure is fine and i can't find any vacuum leaks. Any ideas on what i can look at or what may be a possible cause of this?
Cheers.

get your injectors cleand or your computer might be on its way out.
but id check the injectors first.

My 91 EA with thottle body injection did just that, it got slowly worse until a couple of full blown engine hiccups happened.
I put new plugs,leads,dizzie cap and rotor, and it was like a new car again.
I also sprayed the whole T/B area with T/B spray cleaner from autobarn to remove the carbon buildup they suffer from quite badly .