R34 auto stalled in traffic and struggled to start

[Hobbs]

My 99 r34 non-turbo auto stalled while waiting in traffic. The revs started fluctuating before it died and wouldn’t turn back on, I waited a moment and it struggled to start, dying again when it did. I disconnected the battery momentarily and connected again, revved high when I started the car again and it was running, but the revs were still up and down. 
 

My fuel was on the last quarter line, and I was on a slight slope, and when I was in traffic again 5 minutes later, the problem has disappeared. This happened yesterday and I’ve had no problems driving today.

I’ve recently had timing belt and cam seals replaced. The car feels very sluggish and almost a chore to drive, compared to lower power autos that I’ve driven which feel quicker, I’d love to see if anyone has an idea on what could be the issue.

[GTSBoy]

Could be anything, from dirty/half f**ked IACV, dodgy loom connector that has suffered mechanical stress/damage while being manipulated during the recent work, to a mistake made in the cam/ignition timing setting when putting it back together. I'd suggest that you take it back to the shop that did the belt, along with the above event description, and see if they get any bright ideas.

[joshuaho96]

If it was totally fine before and then suddenly now you're having horrific running issues maybe crack open the ECU and take a look to see if the capacitors have died. Any ECU on original caps from this era is suspect.

[Hobbs]

Alright I checked ignition timing today, and it was accurate and good, however I unplugged the MAF and one of the pins was bent downwards, and when the car was running and I pushed the intake it would stall, so I’ve bent the pin back into place and that seems to have fixed the problem for now.

[Hobbs]

After some testing with a multimeter, the alternator was dying and not charging the battery enough. The car would drop in revs and shudder when I put headlights and high beams on! So problem solved, cheers for the suggestions.