Hello.

I just purchased a 1991 Volvo 240 Station Wagon. It was running wonderfully, no problems at all. Last week i went to take it for a drive and it seemed to be running a little rough when i started it up. I got out on the road and started to accelerate and noticed for about 1 or 2 seconds it would misfire and then run fine. If i took my foot of the gas and accelerated it would again misfire.

It will act like this for around 5min and then smooth right out and run perfectly fine the rest of the day.

Any ideas on what this could be?


Thanks.

 

I would start by pulling and inspecting a spark plug, looking for an overly rich or lean condition.