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What year sporty? If it's a OBDI car 95 and before you can pull the code using a jumper, for OBDII, 96 onwards you will need a scanner, you can also get it scanned at almost any major US parts store.

The CEL is the key, so get the code read, it could tell you the problem straight away, it may be something as simple as a faulty gas cap or blocked vent pipe, as you said it only happens when the tank is low.


OK, I added a bottle of ISO-HEAT premium (red bottle) water remover. The store didn't have Seafoam and I needed to add something right then. It ran like crap for just a bit and I figured I had it under raps with that.

It seemed to settle out but the miss returned.

So I went and had it scanned.
The code reader said #4 cylinder misfire.