I have an 87 Volvo GL. There is gas in the tank, but it is low. The other day I went to start it up and the second I took my foot off of the gas, it died. I put engine treatment in, but still nothing unless I floor the accelerator. Even then, the engine is missing, some smoke comes out of the exhaust and it diesels as well. I checked the distributor cap and cleaned the contacts but haven't done anything else.
Any suggestions?