2000 Other Mazda Models 6 cyl Two Wheel Drive Automatic 128000 miles

I tried starting my truck this morning and after about 10 tries it finally turned over, I had the pedal completely to the floor and it just went...swoooooooosh...and started. I noticed while driving that it sounded like it was running high...I went into 1st gear and shifted to 2nd..sounded normal...then back into drive...and it was running high. There is a check engine signal that just came on a few days ago. Any idea?