Recently I removed the upper intake manifold to clean the clogged EGR passageway. After re-assembling, it ran perfectly for about 30 miles, with more power, quicker acceleration than before. About 30 miles after putting it all back together it started to idle rough, and run rough under load and when accelerating. It also now takes a lot more accelerator to keep it up to speed when cruising. Has anybody had a similar experience , or found a solution? Thank you!