I have a VX

[domggg]

Hi hi have a 1994 vx with a little problem i pulled the spark plugs today and found that cylinder 4 spark plug looked like it was running very lean but i figured it was because of lean burn and such then i pulled the rest of the plugs they were all showing signs of runnining rich any ideas on what could be causing this problem?

i thought it might be injectors but it would be weird since 3 cylinders have that problem

could oxygen sensor be causing this problem

Please any ideas or suggestions will help me it doesnt seem like i am getting the mpgs i should be gettin

thanks