Misfiring when warm - why?
I stuck new coil packs and plugs in the car a few months back and everything was running fine. when I fired it up on the driveway.
I haven't been using it much due to various reasons but took it out for a longer run and suddenly, after about 15-10 minutes it started to lose power and struggle to rev as if the fuel mix was wrong.
I suspected a leak in the air intake as that is bodged together to fix a 2.5 air intake manifold to a 2.8 engine and sure enough I found a leak. I have now fixed this and brushing soapy water reveals to obvious leaks anymore.
Each test drive show the car is perfect, revving smoothly and pulling strongly until suddenly, like a switch is flicked, once it warms through the splutter and power loss happens. Park up for a while to cool down and it is fine. Warm up again and it happens.
MAF broken? Something else?
Help please as it has MASSIVELY failed the MOT on emissions only.
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