Well, we replaced the coolant sensor and no luck. BUT, we think we MAY have found the problem ... the MAF sensor. When we disconnected it, as we read to try in a post somewhere back, the car actually stayed running for over 30 minutes ... and, it did not smell real gassy, nor did it blow the black smoke out the exhaust, like it had been doing. We are crossing our fingers and hoping that if we replace the MAF sensor, this horribly elusive problem will be solved. Before we go out and buy one, though, can I ask if anyone has any advice on what brand to buy, or NOT buy? After checking, seems like they're quite pricey, and we don't want to get a bad one.