Need help on 360 stumbling under light load intermittently. SOLVED!!!

This is more for the benefit of other owners that anything, but I wanted to share my "journey" with all the problems and DTC codes. Ever since I bought the car (360 Spider clutch car 2000 model) it hasn't been right. It was quick, but not that quick. It never seemed to do what I thought it should as far as performance goes. I'm a retired mechanic, so I'm no rookie, but this car had me beat. I had it scanned on SDXs and the results were in my opinion always inconclusive. Most shops are not great at diagnosing problems, they mostly fit new parts. This is meant to be the cure all....but beware of the parts you buy. In my quest to solve various problems I ended up replacing virtually every sensor on the engine. All O2 sensors, 8 coils, new spark plugs, new fuel pumps, injectors ultrasonically cleaned and tested, crank angle sensors, cam position sensors, knock sensors, MAFs and finally the coolant temp sensor. I think that's it.....
When I bought the MAF sensors I bought a pair of factory Bosch ones from the UK as they were the same part number and as far as I could tell, identical to what I as removing from the car. The car ran really well for 2-3 days and then went back to its old ways. Codes suggesting O2 sensor problems, bad ground on MAF circuits, misfires..... so in desperation I pulled the tirgger on a pair of factory Ferrari MAFs. IT appears to me that this was the problem all along. I believe I bought fake MAFs from a vendor in the UK (I'm in d). IF you have performance problems, or constant codes, check your MAFs. I can't begin to tell you the difference they have made to my car. As a further "insurance" kind of thing, I decided to pull the intake off and replace the 8 gaskets, and at the same time replaced the knock and cam position sensors as well as the coolant temp sensor. My car feels like its grown extra cylinders. The difference in performance is simply astonishing. I'm now firmly in the opinion that all my headaches were caused my non original MAFs.

 

Manual gearbox

 

Unfortunately I don’t have the data you’re asking for. My fuel trims were within spec but I constantly got bad ground codes for the MAF circuits. This then also affected the ability of O2 sensors to do their jobs which then resulted in other codes. I was like a dog chasing its tail.

 

Please

keep us updated as to the improvements. Mine started off really well, then just as quickly went bad. The fix was putting in the new genuine Ferrari sourced MAFs. At least that's what happened to mine.

 

In my chasing down faults, I've now replaced every single sensor on the engine. The car is nearly 20 years old, and I figured it couldn't hurt, so I did it. The MOST significant upgrade to drivability and performance AND ease of starting etc was definitely the new MAFs. Now that I've replaced everything, I kind of feel like I've pressed a reset button. Aside from engine internals, there's nothing left to replace. Car runs like a Ferrari should.....now.