So I recently replaced my surpintine drive belts, spark plugs and spark plug wires. I drive a tacoma with a 2.7liter dohc 16valve 4cyl with a 5 speed manual tranny. I doubt that the two belts had anything to do with it but my truck has a high idle now. It normally idles at 1000rpm but now it is at 1250rpm. Can anyone tell me why my idle changed? I feel like it would be the spark plugs and the computer adjusting and breaking in, but I honestly don't know. I just would like some advice before I go and adjust my idle.

 

I'd check to see if you knocked off a vacuum line.