P0300 with p0430
 

I just changed my spark plugs yesterday. I just went on a 200+ mile drive and right when I got to my destination these 2 codes popped up. I have recently seafoamed the intake about a week ago and when I changed the plugs I also carb cleaned the intake. Disco ran like a champ but just posted these codes. Odd. Any ideas???

PS. I have also replaced the catalytic converters less than 30,000 miles ago

Many thanks

Did you change the spark plug wires as well? If you have old wires, they could definitely be the issue. Just bought some 8mm Kingsborne wires for $51 shipped.

They are ordered (Kingsborn 8mm) and hopefully will get here by the weekend.

Also, the Disco is hard to start recently as well. Seems either fuel, spark or air deprived.

K&N Air filter cleaned and oiled. Fuel filter and pump motor just replaced a month ago as well. Thinking these wires might be the trick

The K&N filter will kill you MAF sensor, that could be some of your problem also.

K&N air filters, from my experience, work very well with carbs but terrible with EFI. Just use a paper filter. Clean the MAF with MAF cleaner. Fuel pump issue would more likely cause intermittent no start issues.