No. 88 is a series 4 2nd gen and 91 is a series 5 2nd gen.
Bad Apex seal
No. 86-88 are the same. 89-91 are the same.
4 plugs. 2 are leading and 2 are trailing.
80w 90 gear oil
Yes you can. The only difference will be that the orange marker lights in the front will not fit.
I don't believe it goes anywhere. I have the same unplugged wire.
Coolant temp sensor, or leaky injectors, bad Ecu, weak battery
follow the top rad hose one end goes in rad the other in the thermostat housing
Your idle air control valve may be dirty or clogged, the fuel filter may need changing or the rpm is set to low.
AnswerIf your fuse box does not have a panel to show you what you are looking for (Why the heck it's like that is so stupid), then google "Fuse panel 88 RX7 diagram". You will find some there.
on drivers side of engine below bypass air valve.near oil fill cap. two wire connector