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V6 or 4cyl????
P0301- #1 cylinder misfire
-Faulty spark plug wires/distributor or rotor (4cylinder only)
-Faulty cam/crank sensor (v6 only)
-Faulty #1 ignition coil or coil electrical connector (V6 only)
-#1 Compression loss
P0402- EGR Issue
A code P0402 most likely means one or more of the following has happened:
The DPFE (differential pressure) sensor is faulty and needs to be replaced
There is a blockage in the EGR (most likely carbon buildup)
The EGR valve is faulty
The EGR valve may not be opening due to a lack of vacuum
if i understand u correctly u replaced the distributor and cap if so i would start with making sure my pick up coil was installed correctlyand or replace it.i also would look at the possibility of it being a powertrain control module or neutral safety switch if this vehicle is equipt with one. hope ive been helpful
I would be thinking that there is a good chance that you need to be checking out replacing the computer, if you aren't getting any communication with the proper scan tool then the computer isn't communicating with anything in the vehicle...... I would have guessed first off that the ignition control module might be bad but that is obviously part of the computer also, I would be looking in that direction.
check the wiring harness at the coil,sometimes that plug will get loose or dirty resulting in a no spark.
The only ign system parts are the crank sensor,cam sensor,dist,dist cap,rotor,spark plugs,wires,and coil,and the ecm which controls all of these,is there a check engine light on?
run a scan tool to check for stored codes or system events stored in the ecm.