I bought a reman engine, switched it out, did the toothpick trick to get it close to in-time, but when we started it it immediately revs so high I have to cut the engine. We messed with the timing a little and can only get it to run wide open immediately or or runs extremely rough and sluggish. Is this only timing? Or could there be another issue? We feel pretty confident we got all the vacuum lines on correctly. Do I need to take it to the shop and have it hooked to a computer or what? Very frustrated right now.