Hydrocarbons through the roof.Limit is 220,I got a 1351. <img src="/forums/images/graemlins/barf.gif" alt="" />Could be a problem.This is on a 91 4R 3.0 auto 4x4 with 159K.Everything else passed.Is there a specific component(s) that affect the hydrocarbons?I just recently changed the plugs,wires and cap/rotor with Bosch parts.The engine runs a little rough at idle but smooth at anything above that.The mechanic thinks it might be running rough from a stuck EGR flooding exhaust in the intake and not an electrical problem since it runs good when tested at 2500rpms.Any ideas?Thanks.