Eric. Thank you for the advice using a vacuum gage to see if the exhaust system was restricted. I bought a new one and tests showed ok. As I mention before, I originally had a P0404 and P0172. After changing the egr,pcv valves,and spark plugs, the code P0040 is no longer there. I still have the P0172 and a new P0118.
the engine runs smoothly but it wont go faster than 40 to 50 miles and gears take a long time to engage.
any suggestions?
thanks in advance