94 olds 88 issues
Had the car one month has CEL with code 1640 QDM 1 error. Car hesitates and stumbles going uphill and sometimes acts like it wants to stall after sudden stops, turns. Also,the past week have had serious mpg issues averaging abiut 10mpg and power loss and misfiring at idle and at acceleration. CEL now comes on after car warms up and stays on until I turn the car off. So far I have replaced fuel filter, leaky injector rings,and spark plugs? Anyone know what I can test or rule out next and should computer be replaced? Thanks I posted in the wrong section earlier.