salling problem

[jsbuickpower]

hi i am new here and i have a problem with my Buick its been the most reliable car i have ever had. but recently i have started having problems and i haven't been driving it lately.its a 86 buick gn it started having problems that ended up being a leaking fuel line in the tank and then one day it just died on my in the middle out traffic i pushed it to a parking lot and realized a had low fuel pressure so i drop the tank to throw my old fuel pump in and notice the line in the tank was leaking so i replaced it in the parking lot and it still would not start i checked for spark and had none so i check the crank sensor it some how it came lose and it was just hanging their it was slightly damaged i put it back on and it fired rite up.still have the same sensor witch i should replace. and then it started misfireing real bad and usely stall out and not start back up for a while when i would drive it for 15 min or so i thought it mite be the crank sensor but i just didnt drive it for a while. and now when i start it it runs bad and when i put it in gear it almost seems like the tcc it engaded and it starts to misfire bad drops vac and the vac is usely real chopy sounds like its cammed out put it on a snapon on scanner and it had a code 34 displade and said maf or low circuit current then i did a test and the check engine light flashed 12 and 34 code so i checked the maf with my tester and it came up bad so i but anther one in but it was also bad asides for the maf what would you guy suggest that could cause thse problems any help will be greatly appreciated also for what i now the car is mostly stock asides for a racetronix hot wire kit and a walbro 340 255lph intake the chip says pitbull on it. it had a cat delete and and a flowmaster exhaust but my drive shaft snaped in half and took the exhaust with it as far as i now thats all thats done to it i have not run it at the track but it will blow the tires off in 2nd and leave two posi marks half way throw 3rd when its running right