rough idle repair cost

What is your question?

repair cost volvo xc70 2003 cross country rough idle /engine light is on. It drives but engine sounds rough while running on highway. When I take my feet of gas pedal it runs ok ( while standing still) . I haven't driven it in about 3 months

What makes this problem better or worse?

Just driving ...sound rough

How long has your 2003 Volvo XC70 had this problem?

About 3 days / just started it up yesterday