Hey guys, I just installed a s13 exhaust cam into my 95 s14 intake side and I'm having some serious problems. I marked the chain and gears and installed the 248 cam 4 teeth CCW, I double checked. However it idles like crap and backfires sometimes. The idle oscillates between 500 and 1000 rpm. I did retard the ignition timing a bit (no timing light) but it still idles bad and shakes. Is it possible that I slipped a tooth on the lower sprocked while installing. Anybody experience this?