Here'* the first code. Not sure about the second. Can you recheck?

The EVAP purge valve allows manifold vacuum to purge the canister. The Powertrain Control Module (PCM) supplies a ground to energize the EVAP purge valve (purge ON). The EVAP purge valve control is Pulse Width Modulated (PWM) or turned ON and OFF several times a second. The duty cycle (pulse width) is determined by engine operating conditions including load, throttle position, coolant temperature and ambient temperature. The duty cycle is calculated by the PCM and the output is commanded when the appropriate conditions have been met:

Engine coolant temperature above 25°C (77°F).
After the engine has been running about 2 1/2 minutes on a cold start or 30 seconds on a warm start.
The vehicle is operating in closed loop fuel control.
Canister purge commanded duty cycle varies according to operating conditions determined by mass air flow, fuel trim, and intake air temperature.

Canister purge operation is also affected by throttle position.

VIN K -- Canister purge will be disabled if TP angle increases to above 70 percent. Canister purge will be re-enabled when TP angle decreases below 66 percent
VIN 1 -- Canister purge will be disabled if TP angle increases to above 33 percent. Canister purge will be re-enabled when TP angle decreases below 29 percent
The EVAP vacuum switch is a normally closed switch positioned in the purge line between the canister and the EVAP purge valve. The EVAP vacuum switch will open when vacuum increases to greater than 5 inches of water (in. H2O) in the purge line. The PCM monitors the EVAP vacuum switch signal to determine if the evaporative emission control system is working properly. If the switch is open (purge flow detected) when the PCM is not commanding the EVAP purge valve ON, DTC P1441 will be set.

p1870 has to do with the transmission slipping, it went out about a year ago and we had a rebuilt tranny put in. or they rebuilt the old one.. im not sure. where exactly is the evap vacuum switch located? is it inside the canister?

I'm not sure with your car, try this:

http://134.39.200.6:9001/home.html

xkei,

Besides EGR, I believe a faulty CAT converter could also cause high NOX. With 187,000 miles on the car, that might be worth looking into.

a new cat is what im thinking now also. i took the car in to a local shop and the guy tested the egr valve, it works fine. maybe this would fix the hard starting problem ive been experiencing also?? as i said before sometimes when i crank the engine the EVAP vacuum line and the fuel pressure relief vaccum line which are both plugged into the throttle body will pop off and the car will stall. i couldnt figure out what would cause them to pop off, there is supposed to be vacuum pressure holding them on. would it make sense for a clogged cat to cause enough backpressure that these lines would come off??