(its not the starter, or battery)i have a 1991 camaro rs 3.1. about a year ago it flipped out like it jumped time, so i changed the timing chain only to see it was still in time. it had about 210,000 miles at the time and i have not gotten it running again after a new distributor, IAC, MAPS, 2 COMPUTERS, NEW WIRES, PLUGS, 2 DIFFERENT COILS(THE FIRST ONE TESTED OUT BAD) AND A DECENT SEARCH FOR GROUNDED WIRES. o2 sensor is good, fuel pump relay and pump are good, 45 psi of fuel pressure, turns over but only one cylinder fires ever 5 minutes of turning over.. WHAT IS GOING ON?? oh yeah and before i went replacing stuff it actually cranked with ony a replaced coil and cap and rotor. and ran perfectly for one hour then i cut it off and it cranked, and then kinda acting studdery at low rpm but smoothed out then shut it off again and hasnt cranked in 6 months... ?????????????? and i didnt change anything while it was running then not. (and its not my security key crap. i have already had that problem and fixed it.)

 

Have you tried a ignition switch?..not the one you put the key in either..thats the cylinder.The switch is located on top of the steering column?..will need to lower..NOT remove the column to gain access.

 

lower the column as in via tilt or lower it as in going to remove it but not??
and no i havent' even thought of that. so that would allow it to run fine like it did and then not again? i know its electrical not mechanical but its hard to figure out when it doesnt run you know?

 

Sent you a PM hope it helps..like I said its been awhile since I replaced mine so I might have missed something to remove when tilting the column.

 

2 diff computers .. did u try another 3.1 memcal?

 

have you compression checked it ? sounds very strange, have you cranked with plugs out to check spark ?
just some ideas id do first.

 

i used a spark plug tester so yeah its getting spark, but it shouldnt b compression cause if ****ed up then ran perfect for an our then no more. its a little screw up in something electrical.

 

well this problem was fixed when i checked the actually spark plugs.. they fauled out and couldnt ignite any fuel.. ha.