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P0304, could be a bad plug, bad coil, bad injector, low compression, or other stuff. The P0700, you need to look at codes in the TCM. It is telling you that the trans computer has a fault in it.
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These codes cover 3 different areas. Misfires, cam sensors and transmission issues. I would suggest taking the vehicle to a good mechanic so they can look at it in more detail.
The Codes mean...
P0300 = Random/multiple misfires detected.
P0302 = Cylinder 2 Misfire detected.
P0344 = Camshaft Position sensor Circuit intermittent.
P0700 = Transmission control system malfunction.
Many vehicles have a control module for the automatic transmission called a transmission control module (TCM). The engine control module (ECM) communicates with the TCM to monitor the automatic transmission for faults. If the TCM detects a fault in the automatic transmission and sets a transmission related fault code, the ECM is informed of this also and sets a P0700 in the ECM memory. This illuminates the Malfunction Indicator Lamp (MIL) to let the driver know there is a problem. If this code is present and the MIL (Malfunction Indicator Lamp) is illuminated that basically means there is at least one transmission code set in the TCM's memory. P0700 is an informational code only. It doesn't point to a direct fault in the engine, only a general fault in the transmission. More diagnosis is necessary to identify what the transmission fault is. This requires a scan tool that will communicate with the transmission module.
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