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The cat was definitely the problem. The car is now running better than ever. Thanks again!

Wow! Thanks! We will pull it off after work and see. Im pretty sure this is the problem.

My friend's 87 blew the gasket on the bottom of the turbo. After replacing it the car has no boost. It feels very restricted. The cat appears to have a hole and sounds like a tea kettle. Has this happened to anyone? Can the cat be the problem? I appreciate the feedback.

I’m hoping they didn’t machine the tensioner too small.

So I recently picked up an American Racing Solutions belt tensioner and new oem-style pulley. I noticed that the bearing in the pulley fits a bit sloppy on the belt tensioner. Is this normal? It doesn't seem right. Any feedback will be greatly appreciated. Thanks.

Rick, I had the original ignition module. I tried a friends Delco as well. Perhaps they were both bad. The car would run and idle fine but the problem always occurred under boost.

So I finally fixed the problem after several unsuccessful attempts. I started with the plugs and various gaps. I tried wires and different coil packs. I ended up installing the TR6 and problem solved. The car has never ran better. Thanks to all of you for all the helpful information.

I was wondering if anyone has tapped into their EGR block-off plate for a vacuum source for the brake booster?

I'll try new plugs with less gap first. It could be the stock restrictive muffler as well. It seems more ignition related though. It's much harder to start in the morning than it ever was.

I have been trying to figure out why I can't build more than about 10 lbs. of boost before it backfires/sputters through the intake and looses pressure. It doesn't throw any codes either–all parameters look good. When I did the E85 conversion and turned up the boost, the car ran great the first...

I don't think it's head gasket which is a good thing. However, I was told it could be related to worn original valve springs. I plan to change these out soon.

My stock 86 GN sat for over 10 years before I got it. The valve springs have never been replaced. I plan to do this very soon as I believe they are the root of another issue I'm having. Lately I have noticed a little bit of lifter noise on the driver side, a slight click clack. Will changing the...

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Yes, this will work on a stock GN with a hot wire kit.

I bought this from fullthrottlespeed.com about a month before I decided to convert to e85. I ended up getting a new unit with AN fittings. Like I said, I only had this in my car for a month. Make me an offer. http://www.fullthrottlespeed.com/fuel-sender-w-g7-255-rxp-pump.html

I would like to know the concesous on the best spark plugs for e85. I have stock replacements right now and I think they are the root of my misfire/stumble issue after 15lbs boost. There are a lot of threads arguing plugs but none specific for e85.

It ran good when I first turned up the boost from 13 to 20lbs. I drove it a couple weekends and it was fine. The last couple times I tried getting into it, it would cut out once boost hit about 15. Nothing has changed except maybe topping off the tank with more e85. I got it from the same...

Well the oil and coolant are good. Fuel pressure is good. I don't have any restrictions with the -8 feed and -6 return. I also have a massive fuel filter. It must be spark related as mentioned some of the posts above. I guess I need to open up the wallet yet again and get the TR6, plugs and...

I have been so busy that I haven't had much time to look at the car. Assuming the oil, coolant, plugs, and everything else look ok, should I look into getting the TR6 ignition? Will I have to change chips if so? My other option is just to turn down the boost.

I haven't had time to work on the car lately. I plan to go through it next week. I appreciate the all the feedback. I have only been on E85 for a couple months. I put in a new gas tank, fuel pump, and teflon line kit from Racetronix. I have stock replacement Delco plug wires and NGK UR5's (i...