QuestionI replaced all the plugs and wires and the hard cold starts and slight shutter is still felt. I have read that it can be either an intake manifold leak, to a vacuum leak, all the way to injector clog. At this point I need to know where to start? The trouble code P0300 comes up without specifying the piston of misfire. I was thinking it could be the intake manifold leak because it would apply to all cylinders randomly misfiring instead of just one being clogged and setting off the fault code. I was wondering if you could give me some insight into my problem
Answer3 Inspect Spark Plug Gap Incorrectly gapped spark plug(s).
4 Inspect Distributor Cap Loose or cracked distributor cap
5 Inspect Rotor - Ignition Damaged, worn, or corroded ignition rotor.
6 Inspect Distributor Cap And Rotor Kit Loose, cracked, or worn distributor cap and ignition rotor.
7 Inspect EGR Position Sensor Loose or faulty egr position sensor or circuit.
8 Inspect Fuel Filter Clogged or dirty fuel filter
9 Inspect Fuel Pump Improperly functioning fuel pump or circuits.
10 Inspect Fuel System Pressure Incorrect fuel pressure being delivered to carburetor or fuel injection system.
11 Inspect Fuel Tank Contaminated fuel from rusted or deteriorated fuel tank.
13 Inspect Timing Specification Incorrectly adjusted engine timing.
14 Inspect Choke Thermostat Stuck or improperly functioning choke thermostat.
15 Inspect Distributor Worn, loose or incorrectly adjusted distributor.
16 Inspect EGR Valve Clogged, dirty or improperly functioning or defective egr valve.
17 Inspect Air Charge Sensor Damaged or faulty air charge sensor or air charge sensor circuit.
18 Inspect Air Cleaner Temperature Sensor Damaged or faulty air cleaner temperature sensor or air cleaner temperature sensor circuit.
19 Inspect Barometric Pressure Sensor Damaged or faulty barometric pressure sensor or barometric pressure sensor circuit.
20 Inspect Camshaft Interrupter-Magnet A Damaged or faulty camshaft interrupter-magnet will cause the camshaft position sensor to receive and transmit incorrect ignition and fuel delivery information.
21 Inspect Camshaft Position Sensor A Damaged or faulty camshaft position sensor will transmit incorrect ignition and fuel delivery information.
22 Inspect Coil - Ignition Damaged or faulty ignition coil or ignition coil circuit.
23 Inspect Crankshaft Position Sensor Damaged or faulty crankshaft position sensor or circuit.
24 Inspect Fuel Injector Pressure Regulator Faulty fuel injector pressure regulator or circuit.
25 Inspect MAP Sensor Improperly connected or faulty m.a.p. sensor.
26 Inspect Mass Air Flow Sensor Improperly connected or faulty mass air flow sensor.
27 Inspect Needle Seat Dirty or worn carburetor needle and seat.
28 Inspect Timing Set Slipped timing chain or worn timing gear(s).
29 Inspect PCV Valve Plugged or damaged pcv valve.
Could be a number of things but
Good Luck
