when was the last time the plugs or plug wires where changed? could be bad/weak spark. check distributor cap and rotor too. if it's been a while, might as well give it a good tune up and replace all that.
add another one to the CO bunch
Longmont here, just revived an 87 se-v6 4x4 and breathed some new life into it. might be time to take it on a trail and see how it handles