Replacing fuel injectors in an 86 Toyota truck with a 22R engine typically costs between $100 to $250 per injector, depending on the quality and brand of the injector you choose. Labor costs can vary depending on your location and the mechanic's hourly rate, but in most cases, it can cost anywhere from $100 to $200 to have all four injectors replaced.
You may also want to replace related parts such as injector seals and O-rings, which can add a few more dollars to the total cost. If you're doing the replacement yourself, you'll need to factor in the cost of the tools and equipment needed to remove the old injectors and install the new ones.