I have a 87 dodge aries k car 2.2 litter what does the code series of 1 5 2 2 5 5 mean

I'd say the hard starting is because the coolant temperature sensor is telling computer the wrong coolant temperature, which in turn tells the injectors how much fuel to spray into engine. For example, it tells the computer your coolant is hot, indicating that it is already warmed up so it doesn't need as much fuel to start as if it was cold. Thus causes hard starting. Other side of that, it tells computer engine is cold all the time, thus injector sprays too much fuel, resulting in flooding, or excessive fuel usage/poor gas mileage. Change that sensor first, then see how it runs. The other (speed sensor) is probably what's giving you that holding back feeling It's telling the computer to adjust everything to one speed, when your going another. Don't think either sensor too expensive, as well as fairly easy to change in that year. Be sure when you change these parts, pull your battery terminals off (Negative first) for a couple of minutes to erase codes, then put back on, (positive first), and tighten. My guess is you'll feel like your driving a new car. I'd say the hard starting is because the coolant temperature sensor is telling computer the wrong coolant temperature, which in turn tells the injectors how much fuel to spray into engine. For example, it tells the computer your coolant is hot, indicating that it is already warmed up so it doesn't need as much fuel to start as if it was cold. Thus causes hard starting. Other side of that, it tells computer engine is cold all the time, thus injector sprays too much fuel, resulting in flooding, or excessive fuel usage/poor gas mileage. Change that sensor first, then see how it runs. The other (speed sensor) is probably what's giving you that holding back feeling It's telling the computer to adjust everything to one speed, when your going another. Don't think either sensor too expensive, as well as fairly easy to change in that year. Be sure when you change these parts, pull your battery terminals off (Negative first) for a couple of minutes to erase codes, then put back on, (positive first), and tighten. My guess is you'll feel like your driving a new car.

One other thing, Just in case, pull your oil dipstick & smell it for gas smell. If it was sending too much fuel, it may have trickled past rings into oil pan, thus thining out your oil with gas. Not good at all, so if in doubt, when all's running well, change oil & filter, but don't go to far before you do. If you do smell or suspect gas in oil, change it before you go anywhere, and save your engine. One other thing, Just in case, pull your oil dipstick & smell it for gas smell. If it was sending too much fuel, it may have trickled past rings into oil pan, thus thining out your oil with gas. Not good at all, so if in doubt, when all's running well, change oil & filter, but don't go to far before you do. If you do smell or suspect gas in oil, change it before you go anywhere, and save your engine.