P0304 p0316 codes/ NEW coil,wires,plugs. Good injectors.

Question

New ing. ciol, plug wires, plugs. Cleaned and checked all fuel injectors. slow to take off but seems ok at high speed.

Answer 1

P0304 Misfire number 4 cylinder

P0316 Misfire at start up.

Mechanical problem has to be ruled out, such as compression of that cylinder that is misfiring or better a leak down test of that cylinder.