My 1995 ford f-150 5.0 engine will barely run sometimes. It set codes 211 and 212. How do I test the system?

My 1995 ford f-150 5.0 engine will barely run sometimes. It set codes 211 and 212. How do I test the system?

Read more: My 1995 ford f-150 5.0 engine will barely run sometimes. It set codes 211 and 212. How do I test the system?