Be careful if you use these clowns... while I was overseas the mrs took my1990 silverado here for emissions and inspection(because they have equipment for obd 1). They replaced, among other things, sparkplugs, coil and thermostat, and adjusted the ignition timing. Then passed vehicle for emissions. Just days before I returned (11 months later) Wifey took truck back for emmissions and inspection again and they failed it saying it needs a tune up with new sparkplugs and coil. The truck had driven only 115 miles. Wife showed them the recepts for work done and long story short they backpeddled hard and passed the truck. When I then drove the truck it was overheating (thermostat installed upside down!), and very low on power. I checked ignition timing and they had adjusted it without disconecting the firewall wire, so it was out about 15 degrees. I m pretty sure they re not actual mechanics, just parts fitters and they WILL replace parts that dont need to be....