Does it stink of fuel after trying to start?
Are you sure you have the right plugs in the right holes (Sorry had to ask you would be suprised)
Take one of the plugs out and see if its too rich i.e very oily or clean.
Worst case ECU or something simple just need to start narrowing down the issues.
Your lucky day some things you can go and test with! Some of it was for a Rallye but still digipants system without the supercharger!
1. Engine running warmed up, unplug the blue coolant temp switch, does anything change? No = bad coolant temp.
Alt: 1000 ohms resistance after normal operating temps
2. Air Temp (on intercooler tube) 500 ohms on outer two pins, you have to drill out the cap to get the adjustment.
3. O2 sensor, of course, check the wires/harness for any damage. If you haven't replaced this lately, might be time to get the universal and just crimp the wires on.
4. The TB -> ecu hose must be plugged in the right place. its closed to the passenger side. Unplug the ecu hose from the ECU , if the car still runs like crap, then its the ecu hose. Don't even attempt to drive the car with the ecu hose off.
5. Check your battery voltage, If the battery voltage goes low, the ECU dumps 25% more fuel than normal.
6. The ground wires, to the head, and everywhere else. Bad grounds are a common issue with this car, especially the one to the head.
7. Distributor cap/rotor, remove, inspect and clean dirt. Sandpaper any "growth/corrosion" on the metal contact points.
8. Wires,plugs, you should remove the plugs and inspect for damage, or fouling from being rich.
9. If o2 sensor goes bad, it will kill the cat real quick. Remove the cat by lowering exhaust, look inside, if its crumbly, turned sideways, or black, its probably dead.
10. Check vacuum through boost gauge (10-15psi of vacuum) or MFA (84-104) at idle. Anything else, you might have a big vacuum leak.
11. ISV - if you haven't rerouted it, you may have a leaking ISV.
12. Idle screw on throttle body. Make sure its not gone, or about to fall out. Usually results in "hunting" or high rpm idle.
13. Have you changed the fuel filter lately? Its by the passenger rear wheel. Easy to change, watch out for gas spraying you in the face!
