Ford Fiesta 2008 petrol only starts with easy start?

I had the fuel pump and filter and exhaust ventilation something? Changed and it was starting and then when it was getting down to around 80 miles left in the tank it would start bogging out, but was fine with a full tank, now even with a full tank it will only start with easy start?

Really need help with this please

Sound system still not good enough?

So I have a 2013 VW Jetta. I recently upgraded by stock speakers from the paper-cone stock speakers to some Kenwood KFC-69655S speakers and a Kenwood DDX9703S touch screen head unit (over $500 in product), and my sound system still isn't quite as good as good as I want.

A relative has a Ford Fiesta (base model), with no added sound system, simply stock, and it sounds amazing. Awesome treble, excellent mid, and outstanding bass.

In my car, I still don't hit the low's as much as I would like, and have a lot of rattling of plastic in the door panel, and even some metal (thick tin-can) sound when I try to pump up the volume too much.

I have 4 6.5" speakers, no tweeters and no rear mounted 6x9.

What should I do? Special tuning? Amp? Replace the speakers again? Dampening product in the door?

Electric in car doesn't turn on (int/ext lights, radio, power locks, ect.) and car won't start unless passenger door is opened and closed

I'm not able to use my key fob and have to manually unlock my drivers side door. When I open it, none of the interior lights come on like they're supposed to. Nothing works and I can't even put the car in auxiliary, it does absolutely nothing when I turn the key. Completely dead. Then I open and shut the passenger door and suddenly the interior lights and everything else comes on and I'm able to start the car and everything is normal again. I've never heard of this before? It didn't show any warning before, just randomly happened one day. I have a 2016 ford fiesta.