Cadillac Repair: 1990 Cadilac deville, climbing a hill, climate control

Question
I have a problem with fuel delivery I think. When driving for about 20 miles today stopping briefly at yard sales. The car started hesatating some bucking like not enough fuel getting into injectors. Idling it runs good even if you rev it some. It seems to do more when you but some stain on like climbing a hill or speeding up some. Could it be fule filter or need throttle body area cleaned? Also how do I run a code test on this car. Thanks

Answer
What is your fuel pressure.

CODES:

1. Ignition ON. Engine OFF.

2. Simultaneously push and hold the OFF and WARMER buttons on your climate control panel for 3 seconds and then release them

3. CODES will appaer in the form of lETTER combined with numbers along with the word CURRENT or HISTORY with EACH code displayed.

4. Tell me what the codes are and shut the ignition OFF>