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Yes an OBD 1 meter will give you a better idea as to what the problem is,however it would be more cost effective to find an OBD 2 meter with the capability to test OBD 1 cars.I do have the same problem with my 88 Lasabre,the 3 codes coming up would be the cam shaft sensor($20),the ignition mudule ($140),or the ECM ($80),I found that on mine the number 3 cylinder does not look like it is firing when I inspect the spark plug,but the only code I get # 41.I'am going to start with the cheapest part first.If you have a basic understanding of the mechanics of vehicles(or a haynes repair manual) you could probably replace this yourself.If you already found the solution to this problem please email me at firstname.lastname@example.org so that I can fix mine.Thanks