Power loss in heavy traffic
Started suffering almost complete power loss when in heavy traffic. After 15-20 minutes of stop and go traffic there is just nothing when you press the accelerator. Once you stop, switch off engine, leave it for a minute or so and start again its better, but misfires and doesnt really fix itself until you hit the open road again. My first thought was the MAF was playing up but its reving past 5000 no problem doesnt seem to have lost any top end power.
Any ideas on possible causes?