Cadillac: misfires on 2,4 and 6 cyl, vacum leaks, vacuum leaks

Question
QUESTION: i took my car in to get a diagnostic readout and it said my 2,4 and 6 cyl were misfiring suggestion was to replace the wires and spark plugs also coil pack i did all this and no change i found a couple of vacum leaks and fixed those as well as replacing seals under plenum and maniflod gaskets no change it idles at about 400 and will stop if you let go of the gas it bogs down while im driving got my converter checked and its okay.     is there any sensor that would cause me to misfire? do you think my injectors are bad and how do i check to see if the are bad? this is a 98 catera

ANSWER: Your going to need a diagnostic scanner to see what is causing the misfire.

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QUESTION: OKAY THESE ARE THE CODES IT PULLED PO302,PO304,PO305,PO443,PO505 AND PO300 CAN U HELP

Answer
After EACH code displays the word CURRENT or HISTORY appears. I need to know which are CURRENT and which are HISTORY.

After you find out which are CURRENT or HISTORY. CLEAR (erase) all the codes and drive the car and see which codes return.

Mis-fires can be caused by vacuum leaks in the intake manifold or in vacuum lines as well as worn out spark plugs and spark plug wires.