fuel injection glitch ??

[ga.spyder]

I drove my 82 today,for a couple hours.A little cruising and some very hard driving over Blood Mountain(blew off a Miata ).Car is running great,with a small exception.Several times the car seemed to hiccup.Never during hard acceleration or constant throttle.It only seems to occur at low speed,like pulling away from a light or going very slowly in low gear.Just wondered if anyone had experienced this or had a idea what to check? It seems very minor and intermittent,but I hate to see it become an issue.I did watch the tach when I caught it one time,it doesnt seem to be electrical in nature but its hard to tell.
Thanks,Craig

[pooldoctorstl]

Are you sure it is injection related? Sounds more like an ignition misfire. Secondary ignition (coil output to plugs) runs at higher voltage under load so if you have a bad wire, cap, or plug it will misfire more than at idle or cruise rpm. Put it on a scope if you can and look at the firing patterns under load.

[So Cal Mark]

are you sure the afm flap doesn't stick at any point?

[ga.spyder]

Hey Mark and Jeff,
not really sure of what it could be.I thought I would get some suggestions and then try to check them as a starting point.It could be either of those items,and I will test for them.It is very intermittent,did it 3 times in 2 hours,although I felt it a little more when it was cold.I can check the AFM flap first,I didnt think of that.Car hasnt been driven a lot in the last couple months,and I have been under the hood a lot.Could be as simple as a loose wire/connection.
Craig

[pope]

Several times the car seemed to hiccup.

Are you sure that Denise didnt throw a gallon of White Lightening in the tank?

[ga.spyder]

I can always count on you,Pope

[rlux4]

Is your vacuum advance hooked up Craig? A blown diaphragm created a vacuum leak that caused an occasional stutter at idle, so I plugged the line to it and stopped the nuisance.
And, I'll 2nd Mark's suggestion: check the AFM flap movement. (Throughout the whole range )
Ron

[ga.spyder]

Thanks,Ronster!..I was hoping if I posted something with 'fuel injection' in the title,I could lure you out of hiding! I replaced the vac capsule a couple years back,but I will check the line.Little intermittent stuff like this drive me crazy.Now I have a few ideas on where to start looking.Thanks
Craig