P0300 2002 Nissan Maxima -

Question

• Engine Light ON (or Service Engine Soon Warning Light)
• Lack/loss of power
• Hard start
• Engine hesitation

Answer 1

what you checked for intake leaks? check to see if the exhaust (the catalytic converter) is not clogged, check fuel pressure, it should be 51 psi and idle. 

if you still have the same problem, disconnect 1 ignition coil as a time and see if the car rpm drops or starts shaking, if there is not shaking or rpm drop the coil is bad.

if none of those help check compression