I have a 1992 cadillac seville (4.9) liter when ipull off from a stpo it hesitates like it;s not taking the gas ,when i let off the gas a ease back on it slowly is goes today i stopped at a light at the bottom off a hill and when i pulled off it stumbled all the way to the top before it would run right i couldnt let off it because it wouldnt made it to the top .. arter it passes this little session it runs fine up to 75-80 mph do you have any seggustions.. also a have a code (io39) someone said it was sevice air ride (is that so) also i have a code (e90) could this be my problem i;ve installed new plugs plug wires distributor cap and rotor button and ignition module andstill have this problem please please help i need this car to go to work also i installed a new ignition coil