i have a 1997 ford f150 xlt lariet with the 4.6l idk how long its been sitting but when i went to get in it i had to spray some gas in the intake to get it started and now it starts everytime but its got this like miss in it it had old gas in it but i ran it out and put some new gas with some gas treatment in it. now its getting harder to start up so what could be my problem bad fuel pump? will that cause a miss? or fuel filter? idk i need help any help is appreciated thanks.