Code p300 is the new problem.

Question

My car is a 1997 Camero r/s .I just replaced all the sparks plugs, oxygen sensors up stream next to manifold before cat and spark plug wires. At first the codes said replace these items and now I have P300. Where do I go from here. Please help.

The sparks were set to .060 factory spec.

Answer 1

P0300 Random misfire

Random misfire also means more than 2 cylinder, poor sparkplug wire condition can also set this code, Some of the causes of random misfire are low fuel pressure, unmetered vacuum leaks this also includes the EGR , If the EGR pintle is slighly open it will cause random misfire and does not have to give a code, You can remove the EGR valve and clear any carbon build up that maybe keeping the EGR open.