I started my car the other day and I let it run cause I rarely drive it. When the engine warmed up it started idling up and down non stop and my TCS lgiht and check engine both came on. I let it alone for about a week and same thing happened when I start it everything is good but once it warms up it idles up down non stop. I drove it and it shifts good but u just feel the jerk from the up and down idle. does anybody have an idea what the problem might be??