2004 disco 2 when slowly accelerating between 30-50 mph it stutters (lack of better term) doesn't do it when quickly taking off.... Service engine light on but not blinking code is coming up as secondary AF.

 

code number?

 

Shudders during or independent of shifting?

 

What year, how many miles on it, what fault code numbers, when was it last tuned along with 8 mm silicon wires?

 

Codes are
1415
1412
303
1300
304
307
300
1884

I do know it has a vac leak you can hear it when hood os open. I don't know when it was last tuned i just bought it a bit over a month ago with little to no info know.

 

2004 140xxx miles

 

Anyone??

 

1415 1412 related to SAI system not passing internal test which uses the front O2 sensor voltages.

300 codes are misfires for noted cylinders, 1300 is multiple misfires.

1884 is CAN message between tranny computer and ECU, can have multiple meanings and causes, one would be unstable engine torque, from misfires.


So first order of business is new spark plugs and new plug wires, try to get 8mm silicone insulation. Don't spend money elsewhere until these parts are done, very common cause of misfires.

 

I would definitely do tune up, for starters. see the high mileage service sticky, in the forum. upon purchase of my current d2, it had "stutterish" acceleration, intermittently. That was gone with plugs and wires. have fun, the coil packs are in a tight spot.