Toyota Repair: 1996 toyota tacoma, spark plug wires, compression gauge

Question
QUESTION: i have a 1996 toyota tacoma with 159000 miles that shakes   all the time when engine is on  i already replace the spark plugs whith toyota plugs, also new air filter but stills shakes also i only get around 210 miles per tank . can you please help thanks.

ANSWER: Hello, is this the V-6 engine or 4 cylinder?
Is the check engine light staying on?

---------- FOLLOW-UP ----------

QUESTION: Its a 4 cilinders.    And the ligth is not on

Answer
Try replacing the spark plug wires, if that doesn't help it could be that one of the fuel injectors is bad or the engine has a loss of compression on one cylinder,it could be many things, I would recommend having a repair shop check it unless you have some equipment and tools to do these tests and I can then help you with what to do next.
You would need:
a voltmeter or 12 volt testlight
a cylinder compression gauge