I have a 1994 Dodge Ram 1500, 5.2 engine. When I start my truck everything seems fine. It idles fine, the oil pressure is good. My problems start when I put it in drive. After it warms up I lose oil pressure a little bit and it idles real low, almost to where it stalls. I checked the trouble codes using the check engine light. Only two numbers comes back, 21 which is my O2 Sensor, and 37 which came back as Torque Converter Clutch Solenoid or Trans Temp too High or Too Low. My question is how do I check the the second one (37)??? Thanks in advance for any help.