Hey ya'll, I have a 2003 Chevy Blazer ZR2 with 136,900 miles on her. I recently noticed that there is a very loud click that is only apparent when you are accelerating above 4,000 RPM. The click gets more frequent and louder the higher the RPM goes. The engine light was also on. So now we put in an OB2 sensor and scanned a bad crank sensor. I just recently replaced the crank sensor and now not only is the code back, there is still clicking and there is the code for 2 random misfires. The engine light now will also start blinking at random points (Usually above 30 mph). What the hell do I do now, where do I even start?