[Foley]

What abus319 says is true. Pick your penetrating solution, pour it directly onto the rusted/stuck area and tap, tap, tap, lightly. It's the vibration that will break it loose. P B Blaster, Kroil, Liquid Wrench, and also different home brewed mixtures. ATF alone has very good etching kinda action. I use a 50/50 mixture of diesel fuel and ATF. Lastly, a couple days is not enough. Direct application, tap, tap, tap, and do it everyday, couple times everyday. 10 times everyday. Everytime you walk by the truck. Use the brass drift, tap on the manifold around the distributor hole. Could take more than a week, depending on how badly stuck it is.