Hi and welcome to mightyram. First place to start - check timing/tune/normal ignition service parts + plugs and gaps. If it's all good, then try replacing the ignition coil and ballast resistor. A coil has a lifespan of about 10 years before it starts to break down - it causes poor fuel economy, plug fouling, hard starts and loss of mid to top end rpm power. If you have no spark at all, then you'll need to look at the ICM in the distributor.