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My 98 bravada is fine in the morning when I first start to drive it but after about 20 min or so it starts to sputter and also sputters while it's idling. Does this sound like it could be a plugged cat or sensor? The fuel pump and filter are about 2 years old and I hooked up my obd2 tester and there was no codes as also the check engine light has not come on. Anyone know what this could be or where I should start? Thanks in advance.

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  • First thing to try is cleaning the MAF with some electronics cleaner ... be careful with it as the filament inside the barrel of the MAF is delicate. Dec 24 '14 at 13:38