Classic Sti poor running

[Nesty]

Hello folks, my sti has developed a running problem and I was wondering whether you guys could shed some light please. The back story is as follows.:

It's been stood for a while so I had to jump start it a couple of times to get it started, it ran fine on the way to the petrol station (about 8 miles), I filled it with shell nitro + and it started fine but the battery was obviously quite weak. As it was fully warmed up I then gave it some welly through the first 4 gears, eased off the throttle and then when I applied it again it had a bit of a stutter, then ran really lumpy, did not rev cleanly and is well down on power. It doesn't tick over smoothly and when I accelerate the car shudders.

I've since changed the battery as it was toast but it hasn't improved at all and prior to sitting for a month the car ran like a dream and went very well.

Any suggestions would be gratefully received.

Thanks

Tom

[Nesty]

Thanks for the replies, unfortunately I don't have a code reader.

MDMA, mine is a gf8 95/96 v2 sti, it started to run badly before I changed the battery, do you think having a barely charged battery may have caused this?

Thanks

Tom

[Nesty]

Evening,

Apologies it's been a while, so I've tried the idle reset as suggested by MDMA to no avail and I've plugged the diagnostic cables together and according to the engine check light there are no recorded faults. I haven't taken off and cleared the MAF sensor as I'm guessing if I that was a problem it would have triggered a fault code?

Any other suggestions or should I resign myself to a trip to Roger Clarks which is fairly local to me?

Thanks

Tom

[Nesty]

Ahbefive said:

Did you do the reset before checking for codes?

No I didn't, what is the reset please?

[Nesty]

Ahbefive said:

Did you do the reset before checking for codes?

No I didn't, what is the reset please?

[Nesty]

So I finally found out what was wrong with the car, one of the coils had failed. What added further complexity was the fact the previous owner had changed the coils to those of a newage Subaru and taken the old wiring out of the loom. I took it to Roger Clark in the end and they've sorted it out. Thanks for all the advice.