1991 L98 Probelms
Former Vendor
Joined: Nov 2006
Posts: 2,482
Likes: 3
From: Carmichael ca
When the car dies and won't restart, act fast and check for spark. Spark and no start means a fuel issue. No spark means an ignition problem. Keep and old plug handy, when the car dies pull a plug wire, insert the plug, hold it to ground and crank the engine.
Le Mans Master
Joined: Dec 2000
Posts: 7,839
Likes: 22
From: San Diego, Ca
Intermittents are tough, but a decent scan and some graphing software would probably pinpoint it. In the interim, you seem to have covered the fuel and spark, so I'd take a look at the air part. '91 is speed density, so make sure it's not losing the MAP signal - either through a bad connection/wiring or a failing sensor. You might also see what the BLMS are doing prior to a stall and if it's a stop light issue with an AUTO, make sure the Torque Converter isn't staying locked up (generally a GNX problem, but as our Vette's age, who knows).
Safety Car
Joined: Jan 2004
Posts: 3,783
Likes: 15
From: Northern California
I'd take your Vette to a reputable mechanic who can properly diagnose the problem. It'll save you time and frustration and you can fix the problem yourself after they find the problem to save some money.
