Help, unexplained loss of power

[marauder1]

Over the last month or so I have noticed that the car just doesn't have the power it did have. There are no codes showing up on the diagnostic. At about the same time I started noticing the loss of power the engine started developing a shudder when it is idling. G-tech numbers confirm my seat of the pants feel. Bone stock with nothing but 410 gears & Flowmasters it ran 9.5s(8th mile) now with chip, pullies plugs & stat it will only pull 9.7s. Any ideas what to check.:help:

[Marauderman]

Sorry to hear of your "loss" --1st --we need to get this posted in Community Discussion for better viewing and results hopefully--

Maybe Dennis will see this and can answer or maybe Russeli
(frdwrnch) -try sending them pm's regarding this...Tom

[Smokie]

A couple of places were you can start. I would pull the plugs and check then very carefully, do they all look about the same ? any unusual deposits?, check all your vacuum hoses and wiring under the hood, maybe install new plugs, did you keep original ones ? Maybe a full tank of high quality fuel like Amoco. This is a basic place to start before you get into it deep.

[schuvwj]

Originally posted by marauder1
Over the last month or so I have noticed that the car just doesn't have the power it did have. There are no codes showing up on the diagnostic. At about the same time I started noticing the loss of power the engine started developing a shudder when it is idling. G-tech numbers confirm my seat of the pants feel. Bone stock with nothing but 410 gears & Flowmasters it ran 9.5s(8th mile) now with chip, pullies plugs & stat it will only pull 9.7s. Any ideas what to check.:help:

marauder1 I've also noticed a loss of power and it also shudders when idling cold only.

My mods are very simular to yours. Maybe its time we pulled some denso plugs to see if we have simular results?

I drove mine last night about 100 miles and it seems to be working very hard at lower RPMs, like the parking brake was set part of the way, (but is was not).

When WOT is asked for it seems to have lost some of the seat of the pants power and I also use Amoco Gold 93 Octane.

[schuvwj]

My wife also mentioned to me yesterday that she could smell a lite odor of antifreeze during my MM warm up. It was 90 Deg F. outside at that time so I had the air on.

Level on antifreeze in thte container this morning is not showing any loss of antifreeze. Also there is nothing driping on the garage floor, bone dry.
I will be watching this one and hope they are not both related!

[merc406]

Do what Smokie says and change fuel filter and maybe brand of fuel for awhile to see any change for the better.

[marauder1]

I'm working all this weekend but as soon as I can I plan to pull the plugs. I have switched to Amoco 93, it seemed to help a little.