How to solve my Discovery low acceleration when driving?

Can mangoose help or not

 

Looks like it can't unless their website is wrong. It says LRs from 2005 up (assuming you have a D1 or D2). Can you describe, in detail, how it is running differently than normal? Are there any lights flashing or lit up (Specifically your check engine light)? Have you checked your air filter, spark plugs, plug wires, make sure you didn't squish your exhaust going over an obstacle, etc. How's your oil level and color? Metal flakes? There's simply not a lot of info to go on here.

 

Oh, also check your MAF sensor. It's right after our air filter box and before your intake hose that attaches to your throttle body. Pull it out of the filter box and look down it. See that little metal wire? Is it brown or silver? If it's brown then you either need to try cleaning your MAF (short lasting temporary fix) or you need a new MAF (as close to a permanent fix as you can get)

Just try going through and giving it a general tune up. Plugs, wires, air filter, oil change, oil filter, differential fluids, transmission fluid, transfer case fluid, radiator flush and coolant, etc. After that, see if it fixes your problem and go from there.

 

D1 is a 0-60mph in 11 secs. not a fast accelerator. Fuel pressure? Have you checked lately? Tune-up as above. No known facts of care, maintenance or miles. Or even what model of 4 Discoveries.