What is the firing order for a 1990 Toyota truck 22R?

The firing order of any engine should be cast into the intake manifold. Check the manifold for a series of numbers that agrees with the number of cylinders in your engine 1-3-4-2 See http://aarc.epnet.com/application/9081/9081CH2_FIRING_ORDERS.htm Joe, owner 1986 Toyota Pick Up with R22 engine