I just finished installing Armond's intake manifold on my car and couldnt wait to try it. Before I did, I was going to refill my coolant system after draining it for the installation. When I started the car, the whole vehicle began to shake madly! The RPMs were jumping from 1300-1500. I hit the throttle a couple of times thinking that it needed to warm up but no, so I didnt want to leave it on any further. Did I miss something on the installation? I double checked on plugging in all my sensors and everything. It felt like the air in the intake mani were going through obsticles in order to run through, please help!

P.S. Oh I also changed my water temp sensor...but I don't think that shouldve been the problem.