I HAVE A 2004 MONTE CARLO 3.8. MY PROBLEM IS THE TACH WHICH I AM FINDING TO BE A PROBLEM ON MANY CHEVY MODELS INCLUDING THE SILVERADO. OCCASIONLY THE TACH WILL GO VERY HIGH IN RPM AND OTHER TIMES IT WILL STICK AT A CERTAIN RPM. AS YOU DRIVE WHILE THIS HAPPENS THE SPEEDOMETER EVENTUALLY GOSE TO 0. ANYONE HAVE THIS CONCERN AND IS THERE AN EASY FIX?