Hi charlie_Brown,
Hesitation can be caused by many things ... so when RMSPOWER suggests checking your plug wires, it doesn't mean go out and buy a new set of wires to see if your car runs better. The odds are that you will see no improvement. But I agree with RMSPOWER, this should be checked.
Here's how to test spark plug wires (high tension leads):
1. Visually inspect the spark plug wires carefully for cracks or burn marks. Throw away any that have them.
2. Measure resistance with an ohmmeter. Resistor wires (modern wires) should be around 10,000 ohms per foot. Antique or racing wires will have far less resistance. Throw out any with resistance too high.
3. Check the metals ends of the wires and the distributor cap. If one end is oxidized compared to the others (e.g one plug end is oxidized, the other three are shiny), that cylinder isn't firing correctly. Could be the cap, the wire, a vacuum leak, bad cylinder compression or some other reason.
The most common cause of hesitation is a vacuum leak. It usually costs no money to fix this, but instead takes time and patience to rule out. There are some tips on checking air leaks in the Tech Section article
Carb adjustment, troubleshooting, rebuild and inspection
Transfer
