Help,,,,Engine codes obd1 type

anyone out there that knows what usually causes a code 327 and 335 ? its a 95 contour w/ a 2.0L and is said to have OBD1 type computer,,, Car seems to be losing a cylinder only at times,,,almost like vacume leak,,, I've checked everyline,, changed MAF and the coolant temp sensor as well,,, any suggestions what might be causing car to drop a cylinder from time to time??

drop a cylinder????? are you talking about a misfire?

bad spark plug, loose/ defective spark plug wire

bad spark plug, loose/ defective spark plug wire 95 contour, ,,2.0L,,,, I start the engine and sometimes it acts like it looses a cylinder,,, like runs on three cylinders,, wind it up a bit,, sometimes it'll comeback,,, but usually takes awhile,, changed the coil pack,,, changed injectors,, and even did the MAF sensor and coolant sensors as well,,,It comes up with a codes 327 and 335, EGR sensor pressure differential valve,, anyone have this problem before?? or Am I blessed again with the first contour with hemeroids once again?

Make sure the egr valve is not stuck open too...disconnect the vacuum line going to the egr valve and see if it makes a difference...

Make sure the egr valve is not stuck open too...disconnect the vacuum line going to the egr valve and see if it makes a difference...
Hey XJoeharper,, thanks for the piece of infor,, I believe your infor is close,, the 327 and 335 seems to be the trick,,, EGR diff solenoid,,,,, caues the EGR to stick open,,, I recon,, I found this really great site for all Idle problems for 2.0L motors and problems that occur thanks to Fords quality parts,,,, EGR DIff sensor is one of them,,as well as Tfitting under COil pack and several other tidbits of Infor sent over from the Brits,, overseas,, God knows they've had their hands full of these cars for years now,,,, they are Good teachers if you can understand the language,,, HEre's the webpage if you ever need it,,, Good Luck and happy motoring,,,,,,http://www.btinternet.com/~madmole/Reference/Idle.html