My car was sitting for a couple of days and today I took it out. At first it pulled really hard and then it seems like when it is about to shift into 2nd it falls off. All i did to it was change the plugs from 44's to 43's and it ran fine when I first did this. Vac looks good also, around 15 at idle. Don't know what else to look for except putting in more and better gas. It builds boost fine but doesn't pull as hard as it did before. Any help appreciated.