I HAVE A 1988 BUICK REGAL 2.8 ONLY 53,000 MILLS (ORIGINALY) I JUST HAD THE CATHALITIC CONVERTER INSTALLED NEW, SINCE THAT THE CAR WILL NOT IDOL CORRECTLY, IT WILL ACCELERATES AND DECCELERATE TO THE POINT IT SHUTS OFF.NEED HELP WHITH THIS PROBLEM.I HAVE HAD THE CAR SINCE NEW NEVER HAD A PROBLEM LIKE THIS, ITS TO OLD TO TAKE TO DEALER TO GET CHECK.