i have a 2000 disco 2 with 132,000 on it. replaced the plugs and wires with magnacore 8mm and bosch +4 plugs induction cleaning seafoam in the gas throttle body clean it ran amazing for a month. now it is missfireing bad.

when the engine is cold the problem is the worst. when it heats up it is not bad or unnoticable. seems to missfire most when accelerating. almost stalls when its cold and accelerating here are the codes
0174 0734
0171 0733
1174 0301
1171 0303
1300 0305
0307 0300

i know some of them are a bad mass air flow sensor. so are the other ones bad coil packs, or bad injectors. or what?? really have no idea. took the plugs out they look good. i am getting missfires from all cylinders. would both packs go out at the same time or just one? help me out!!!!!

 

Make sure that all of your plug wires are on tight at the coils.

 

Go clear the codes, one more time and get back to us with what shows up. What air filter are you using and have you ever tried to clean the MAF, DON'T.