I have a Jeep Wrangler with manual transmission and soon after starting the vehicle seems like it isn't getting enough gas when I accelerate, but only for like 30 seconds or so then it is fine. This has been going on for about 5 months and hasn't gotten any worse. I have also noticed that if I let the Jeep idle the rpm's will fluctuate up and down almost to the point of stalling, this also only happens soon after the vehile is started, and only happens for about 30 seconds or so. Thanks