Last week I pulled my Sy out of storage (its been sitting for about a year and a half) and it ran terrible. It took 10-12 tries before it would start up. The idle was ok, but as soon as you gave it any gas it stuttered horribly. Driving up and down the street I couldn't get it to run above 2k rpm. So then I replaced the cap, rotor, and plug wires. I didn't replace the plugs (CR42TS's) because they only had about 100 miles on them and the 2 that I checked looked perfect.
After that I'd say the truck ran about 30% better, but it still took about a dozen attempts to start it and had a pretty bad off-idle misfire. So I bought a fuel filter, slapped it in there, and tried again. It fired up on the first crank
but still had the same misfire
Then I drove it around a bit, bought some fuel injector cleaner, and filled it up with gas. While I was out, I noticed that most of the time when it hesitated, the tach would stay pretty much where I thought it should be, but other times it would bounce around. That had me thinking coil so I swapped that out. Now the tach doesn't bounce around, but the misfire is still there.
I'm not sure what I should try next. As it stands now, the truck idles fine and revs freely in neutral. In gear, it falls flat on its face if I give it more than 1/8-1/4 throttle when its below about 2k rpm. When I get it above 2k rpm, either by shifting manually or in drive, I can give it about half throttle before it does the same thing. The problem seems to be the same whether the engine has warmed up or not. My truck is 100% stock (well except for the new MSD wires and dist. cap).
I bought a 255 lph fuel pump, but I'm waiting for an empty tank before I tackle that one. Any other suggestions? Sorry about the long post, but I figure the details may help.
After that I'd say the truck ran about 30% better, but it still took about a dozen attempts to start it and had a pretty bad off-idle misfire. So I bought a fuel filter, slapped it in there, and tried again. It fired up on the first crank
but still had the same misfire Then I drove it around a bit, bought some fuel injector cleaner, and filled it up with gas. While I was out, I noticed that most of the time when it hesitated, the tach would stay pretty much where I thought it should be, but other times it would bounce around. That had me thinking coil so I swapped that out. Now the tach doesn't bounce around, but the misfire is still there.
I'm not sure what I should try next. As it stands now, the truck idles fine and revs freely in neutral. In gear, it falls flat on its face if I give it more than 1/8-1/4 throttle when its below about 2k rpm. When I get it above 2k rpm, either by shifting manually or in drive, I can give it about half throttle before it does the same thing. The problem seems to be the same whether the engine has warmed up or not. My truck is 100% stock (well except for the new MSD wires and dist. cap).
I bought a 255 lph fuel pump, but I'm waiting for an empty tank before I tackle that one. Any other suggestions? Sorry about the long post, but I figure the details may help.
